Information disclosure in JUnit4 (CVE-2020-15250)
Published Last modified Sources: BSI, Red Hat, CVE.org, OSV
What is affected, what to do
In JUnit4 from version 4.7 and before 4.13.1, the test rule TemporaryFolder contains a local information disclosure vulnerability. On Unix like systems, the system's temporary directory is shared between all users on that system.
Update Junit-team Junit4 to version 4.13.1.
- Affected
- Junit-team Junit4
lt *..4.13.1
- Junit-team Junit4
- Fixed in
- Junit-team Junit4
4.13.1
- Junit-team Junit4
Not sure whether and how you are affected? Ask a question about this vulnerability
Metrics
5.5
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
4.4
CVSS v3
Severity Medium on the scale from 0 to 10.
Source: BSI, Red Hat, CVE.org, OSV
1.7 %
EPSS score
Moderate — model estimates 1-10% exploitation likelihood.
Source: FIRST EPSS, percentile 77.1
Show all metrics
- Severity
- Medium
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 69.60 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 5.5 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 4.4
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 1.7 %
- Moderate — model estimates 1-10% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 77.1
- High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
- CISA assessment (SSVC)
- Exploitation: none known · not automatable · Technical impact: partial
- Source: CISA Vulnrichment, as of 7 October 2026
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-200
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
In JUnit4 from version 4.7 and before 4.13.1, the test rule TemporaryFolder contains a local information disclosure vulnerability. On Unix like systems, the system's temporary directory is shared between all users on that system. Because of this, when files and directories are written into this directory they are, by default, readable by other users on that same system. This vulnerability does not allow other users to overwrite the contents of these directories or files. This is purely an information disclosure vulnerability. This vulnerability impacts you if the JUnit tests write sensitive information, like API keys or passwords, into the temporary folder, and the JUnit tests execute in an environment where the OS has other untrusted users. Because certain JDK file system APIs were only added in JDK 1.7, this this fix is dependent upon the version of the JDK you are using. For Java 1.7 and higher users: this vulnerability is fixed in 4.13.1. For Java 1.6 and lower users: no patch is available, you must use the workaround below. If you are unable to patch, or are stuck running on Java 1.6, specifying the `java.io.tmpdir` system environment variable to a directory that is exclusively owned by the executing user will fix this vulnerability. For more information, including an example of vulnerable code, see the referenced GitHub Security Advisory.
Source: BSI CSAF, BSI WID Portal, redhat_csaf, cvelistv5, NVD (NIST), OSV (Open Source Vulnerabilities)
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| junit-team | junit4 |
|
|
| apache | pluto |
|
|
| junit | junit4 |
|
|
| oracle | communications_cloud_native_core_policy |
|
|
| Dell | ECS |
|
|
| IBM | Tivoli Netcool/OMNIbus |
|
|
Vendors and products
Affected operating systems
| Linux | debian | debian_linux | 9.0 |
Weakness classes (CWE)
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
Class
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
Entry at MITRE CWE-200
References & sources
- github.comjunit-team/junit4/security/advisories/GHSA-269g-pwp5-87ppweb, x_refsource_CONFIRM
- NVD (NIST)vuln/detail/CVE-2020-15250advisory
- github.comjunit-team/junit4/issues/1676web, x_refsource_MISC
- github.comjunit-team/junit4/commit/610155b8c22138329f0723eec22521627dbc52…web, x_refsource_MISC
- lists.apache.orgthread.html/ra1bdb9efae84794e8ffa2f8474be8290ba57830eefe9714b95…web
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- lists.apache.orgthread.html/rf797d119cc3f51a8d7c3c5cbe50cb4524c8487282b986edde8…web
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
Record modifiedGitHub
New references:- https://github.com/junit-team/junit4/blob/7852b90cfe1cea1e0cdaa19d490c83f0d8684b50/doc/ReleaseNotes4.13.1.md
- https://github.com/junit-team/junit4/commit/610155b8c22138329f0723eec22521627dbc52ae
- https://github.com/junit-team/junit4/issues/1676
- https://github.com/junit-team/junit4/security/advisories/GHSA-269g-pwp5-87pp
and 8 more references
Show 85 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://github.com/junit-team/junit4/blob/7852b90cfe1cea1e0cdaa19d490c83f0d8684b50/doc/ReleaseNotes4.13.1.mdReference added —https://github.com/junit-team/junit4/commit/610155b8c22138329f0723eec22521627dbc52aeReference added —https://github.com/junit-team/junit4/issues/1676Reference added —https://github.com/junit-team/junit4/security/advisories/GHSA-269g-pwp5-87ppReference added —https://junit.org/junit4/javadoc/4.13/org/junit/rules/TemporaryFolder.htmlReference added —https://lists.apache.org/thread.html/r01110833b63616ddbef59ae4e10c0fbd0060f0a51206defd4cb4d917%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.apache.org/thread.html/r09cfbb5aedd76023691bbce9ca4ce2e16bb07dd37554a17efc19935d%40%3Cpluto-dev.portals.apache.org%3EReference added —https://lists.apache.org/thread.html/r1209986f79359b518d09513ff05a88e5b3c398540e775edea76a4774%40%3Cdev.knox.apache.org%3EReference added 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removed https://lists.debian.org/debian-lts-announce/2020/11/msg00003.html Types: Mailing List, Third Party Advisory—Reference type removed https://www.oracle.com/security-alerts/cpuapr2022.html Types: Patch, Third Party Advisory—Source identifier: security-advisories@github.com
Record modifiedCISA ADP
CISA assessment (SSVC): exploitation: none known, automatable: no
Show the original change
Individual changes of this event as published by NVD Type Action Before After SSVC assessment added —{"id":"CVE-2020-15250","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-07T20:08:44.306615Z"}Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Record modifiedCVE Program
New references:- https://github.com/junit-team/junit4/blob/7852b90cfe1cea1e0cdaa19d490c83f0d8684b50/doc/ReleaseNotes4.13.1.md
- https://github.com/junit-team/junit4/commit/610155b8c22138329f0723eec22521627dbc52ae
- https://github.com/junit-team/junit4/issues/1676
- https://github.com/junit-team/junit4/security/advisories/GHSA-269g-pwp5-87pp
and 8 more references
Show 85 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://github.com/junit-team/junit4/blob/7852b90cfe1cea1e0cdaa19d490c83f0d8684b50/doc/ReleaseNotes4.13.1.mdReference added —https://github.com/junit-team/junit4/commit/610155b8c22138329f0723eec22521627dbc52aeReference added —https://github.com/junit-team/junit4/issues/1676Reference added —https://github.com/junit-team/junit4/security/advisories/GHSA-269g-pwp5-87ppReference added —https://junit.org/junit4/javadoc/4.13/org/junit/rules/TemporaryFolder.htmlReference added —https://lists.apache.org/thread.html/r01110833b63616ddbef59ae4e10c0fbd0060f0a51206defd4cb4d917%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.apache.org/thread.html/r09cfbb5aedd76023691bbce9ca4ce2e16bb07dd37554a17efc19935d%40%3Cpluto-dev.portals.apache.org%3EReference added —https://lists.apache.org/thread.html/r1209986f79359b518d09513ff05a88e5b3c398540e775edea76a4774%40%3Cdev.knox.apache.org%3EReference added —https://lists.apache.org/thread.html/r29d703d1986d9b871466ff24082a1828ac8ad27bb0965a93a383872e%40%3Cpluto-scm.portals.apache.org%3EReference added —https://lists.apache.org/thread.html/r2b78f23bc2711a76a7fc73ad67b7fcd6817c5cfccefd6f30a4f54943%40%3Cdev.knox.apache.org%3EReference added —https://lists.apache.org/thread.html/r30f502d2f79e8d635361adb8108dcbb73095163fcbd776ee7984a094%40%3Ccommits.creadur.apache.org%3EReference added —https://lists.apache.org/thread.html/r500517c23200fb2fdb0b82770a62dd6c88b3521cfb01cfd0c76e3f8b%40%3Cdev.creadur.apache.org%3EReference added —https://lists.apache.org/thread.html/r5f8841507576f595bb783ccec6a7cb285ea90d4e6f5043eae0e61a41%40%3Cdev.creadur.apache.org%3EReference added —https://lists.apache.org/thread.html/r687f489b10b0d14e46f626aa88476545e1a2600b24c4ebd3c0d2a10b%40%3Cdev.knox.apache.org%3EReference added —https://lists.apache.org/thread.html/r717877028482c55acf604d7a0106af4ca05da4208c708fb157b53672%40%3Ccommits.creadur.apache.org%3EReference added —https://lists.apache.org/thread.html/r742b44fd75215fc75963b8ecc22b2e4372e68d67d3d859d2b5e8743f%40%3Cdev.knox.apache.org%3EReference added —https://lists.apache.org/thread.html/r8b02dc6f18df11ff39eedb3038f1e31e6f90a779b1959bae65107279%40%3Cdev.knox.apache.org%3EReference added —https://lists.apache.org/thread.html/r925eaae7dd8f77dd61eefc49c1fcf54bd9ecfe605486870d7b1e9390%40%3Cpluto-dev.portals.apache.org%3EReference added —https://lists.apache.org/thread.html/r934208a520b38f5cf0cae199b6b076bfe7d081809528b0eff2459e40%40%3Cdev.knox.apache.org%3EReference added —https://lists.apache.org/thread.html/r95f8ef60c4b3a5284b647bb3132cda08e6fadad888a66b84f49da0b0%40%3Ccommits.creadur.apache.org%3EReference added —https://lists.apache.org/thread.html/r9710067c7096b83cb6ae8f53a2f6f94e9c042d1bf1d6929f8f2a2b7a%40%3Ccommits.knox.apache.org%3EReference added —https://lists.apache.org/thread.html/ra1bdb9efae84794e8ffa2f8474be8290ba57830eefe9714b95da714b%40%3Cdev.pdfbox.apache.org%3EReference added —https://lists.apache.org/thread.html/raebf13f53cd5d23d990712e3d11c80da9a7bae94a6284050f148ed99%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.apache.org/thread.html/rb2771949c676ca984e58a5cd5ca79c2634dee1945e0406e48e0f8457%40%3Cdev.creadur.apache.org%3EReference added —https://lists.apache.org/thread.html/rb2ffe2993f4dccc48d832e1a0f1c419477781b6ea16e725ca2276dbb%40%3Cdev.knox.apache.org%3EReference added —https://lists.apache.org/thread.html/rb33212dab7beccaf1ffef9b88610047c644f644c7a0ebdc44d77e381%40%3Ccommits.turbine.apache.org%3EReference added —https://lists.apache.org/thread.html/rbaec90e699bc7c7bd9a053f76707a36fda48b6d558f31dc79147dbf9%40%3Cdev.creadur.apache.org%3EReference added —https://lists.apache.org/thread.html/rc49cf1547ef6cac1be4b3c92339b2cae0acacf5acaba13cfa429a872%40%3Cdev.creadur.apache.org%3EReference added —https://lists.apache.org/thread.html/rdbdd30510a7c4d0908fd22075c02b75bbc2e0d977ec22249ef3133cb%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.apache.org/thread.html/rde385b8b53ed046600ef68dd6b4528dea7566aaddb02c3e702cc28bc%40%3Ccommits.creadur.apache.org%3EReference added —https://lists.apache.org/thread.html/rde8e70b95c992378e8570e4df400c6008a9839eabdfb8f800a3e5af6%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.apache.org/thread.html/rdef7d1380c86e7c0edf8a0f89a2a8db86fce5e363457d56b722691b4%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.apache.org/thread.html/rea812d8612fdc46842a2a57248cad4b01ddfdb1e9b037c49e68fdbfb%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.apache.org/thread.html/reb700e60b9642eafa4b7922bfee80796394135aa09c7a239ef9f7486%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.apache.org/thread.html/rf2ec93f4ca9a97d1958eb4a31b1830f723419ce9bf2018a6e5741d5b%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.apache.org/thread.html/rf6e5d894d4b03bef537c9d6641272e0197c047c0d1982b4e176d0353%40%3Cdev.knox.apache.org%3EReference added —https://lists.apache.org/thread.html/rf797d119cc3f51a8d7c3c5cbe50cb4524c8487282b986edde83a9467%40%3Ccommits.pulsar.apache.org%3EReference added —https://lists.debian.org/debian-lts-announce/2020/11/msg00003.htmlReference added —https://www.oracle.com/security-alerts/cpuapr2022.htmlReference removed https://github.com/junit-team/junit4/blob/7852b90cfe1cea1e0cdaa19d490c83f0d8684b50/doc/ReleaseNotes4.13.1.md—Reference removed https://github.com/junit-team/junit4/commit/610155b8c22138329f0723eec22521627dbc52ae—Reference removed https://github.com/junit-team/junit4/issues/1676—Reference removed https://github.com/junit-team/junit4/security/advisories/GHSA-269g-pwp5-87pp—Reference removed https://junit.org/junit4/javadoc/4.13/org/junit/rules/TemporaryFolder.html—Reference removed https://lists.apache.org/thread.html/r01110833b63616ddbef59ae4e10c0fbd0060f0a51206defd4cb4d917%40%3Ccommits.pulsar.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r09cfbb5aedd76023691bbce9ca4ce2e16bb07dd37554a17efc19935d%40%3Cpluto-dev.portals.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r1209986f79359b518d09513ff05a88e5b3c398540e775edea76a4774%40%3Cdev.knox.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r29d703d1986d9b871466ff24082a1828ac8ad27bb0965a93a383872e%40%3Cpluto-scm.portals.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r2b78f23bc2711a76a7fc73ad67b7fcd6817c5cfccefd6f30a4f54943%40%3Cdev.knox.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r30f502d2f79e8d635361adb8108dcbb73095163fcbd776ee7984a094%40%3Ccommits.creadur.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r500517c23200fb2fdb0b82770a62dd6c88b3521cfb01cfd0c76e3f8b%40%3Cdev.creadur.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r5f8841507576f595bb783ccec6a7cb285ea90d4e6f5043eae0e61a41%40%3Cdev.creadur.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r687f489b10b0d14e46f626aa88476545e1a2600b24c4ebd3c0d2a10b%40%3Cdev.knox.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r717877028482c55acf604d7a0106af4ca05da4208c708fb157b53672%40%3Ccommits.creadur.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r742b44fd75215fc75963b8ecc22b2e4372e68d67d3d859d2b5e8743f%40%3Cdev.knox.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r8b02dc6f18df11ff39eedb3038f1e31e6f90a779b1959bae65107279%40%3Cdev.knox.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r925eaae7dd8f77dd61eefc49c1fcf54bd9ecfe605486870d7b1e9390%40%3Cpluto-dev.portals.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r934208a520b38f5cf0cae199b6b076bfe7d081809528b0eff2459e40%40%3Cdev.knox.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r95f8ef60c4b3a5284b647bb3132cda08e6fadad888a66b84f49da0b0%40%3Ccommits.creadur.apache.org%3E—Reference removed https://lists.apache.org/thread.html/r9710067c7096b83cb6ae8f53a2f6f94e9c042d1bf1d6929f8f2a2b7a%40%3Ccommits.knox.apache.org%3E—Reference removed https://lists.apache.org/thread.html/ra1bdb9efae84794e8ffa2f8474be8290ba57830eefe9714b95da714b%40%3Cdev.pdfbox.apache.org%3E—Reference removed https://lists.apache.org/thread.html/raebf13f53cd5d23d990712e3d11c80da9a7bae94a6284050f148ed99%40%3Ccommits.pulsar.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rb2771949c676ca984e58a5cd5ca79c2634dee1945e0406e48e0f8457%40%3Cdev.creadur.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rb2ffe2993f4dccc48d832e1a0f1c419477781b6ea16e725ca2276dbb%40%3Cdev.knox.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rb33212dab7beccaf1ffef9b88610047c644f644c7a0ebdc44d77e381%40%3Ccommits.turbine.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rbaec90e699bc7c7bd9a053f76707a36fda48b6d558f31dc79147dbf9%40%3Cdev.creadur.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rc49cf1547ef6cac1be4b3c92339b2cae0acacf5acaba13cfa429a872%40%3Cdev.creadur.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rdbdd30510a7c4d0908fd22075c02b75bbc2e0d977ec22249ef3133cb%40%3Ccommits.pulsar.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rde385b8b53ed046600ef68dd6b4528dea7566aaddb02c3e702cc28bc%40%3Ccommits.creadur.apache.org%3E—Reference removed 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https://lists.apache.org/thread.html/rf797d119cc3f51a8d7c3c5cbe50cb4524c8487282b986edde83a9467%40%3Ccommits.pulsar.apache.org%3E—Reference removed https://lists.debian.org/debian-lts-announce/2020/11/msg00003.html—Reference removed https://www.oracle.com/security-alerts/cpuapr2022.html—Reference type removed https://github.com/junit-team/junit4/blob/7852b90cfe1cea1e0cdaa19d490c83f0d8684b50/doc/ReleaseNotes4.13.1.md Types: Release Notes, Third Party Advisory—Reference type removed https://github.com/junit-team/junit4/commit/610155b8c22138329f0723eec22521627dbc52ae Types: Patch, Third Party Advisory—Reference type removed https://github.com/junit-team/junit4/issues/1676 Types: Issue Tracking, Third Party Advisory—Reference type removed https://github.com/junit-team/junit4/security/advisories/GHSA-269g-pwp5-87pp Types: Exploit, Third Party Advisory—Reference type removed https://junit.org/junit4/javadoc/4.13/org/junit/rules/TemporaryFolder.html Types: Vendor Advisory—Reference type removed https://lists.debian.org/debian-lts-announce/2020/11/msg00003.html Types: Mailing List, Third Party Advisory—Reference type removed https://www.oracle.com/security-alerts/cpuapr2022.html Types: Patch, Third Party Advisory—Source identifier: af854a3a-2127-422b-91ae-364da2661108
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<a href="https://intel.neosec.eu/en/cve/CVE-2020-15250"><img src="https://intel.neosec.eu/badge/cve/CVE-2020-15250.svg?lang=en" alt="CVE-2020-15250 – NEOSEC Intel" height="20"></a>