MediumCVE-2021-21290

    Local Information Disclosure Vulnerability in Netty on Unix-Like systems due temporary files (CVE-2021-21290)

    Published Last modified Sources: Red Hat, BSI, Debian, CVE.org, OSV

    What is affected, what to do

    Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty before version 4.1.59.Final there is a vulnerability on Unix-like systems involving an insecure temp file.

    Update Netty to version 4.1.59.Final.

    Affected
    • Netty lt *..4.1.59.Final
    Fixed in
    • Netty 4.1.59.Final

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    6.2

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v3

    6.2

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: Red Hat, BSI, Debian, CVE.org, OSV

    1.8 %

    EPSS score

    Moderate — model estimates 1-10% exploitation likelihood.

    Source: FIRST EPSS, percentile 78.1

    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
    79.80 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
    6.2 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
    6.2
    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
    1.8 %
    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
    78.1
    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
    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-378, CWE-379

    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

    Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty before version 4.1.59.Final there is a vulnerability on Unix-like systems involving an insecure temp file. When netty's multipart decoders are used local information disclosure can occur via the local system temporary directory if temporary storing uploads on the disk is enabled. On unix-like systems, the temporary directory is shared between all user. As such, writing to this directory using APIs that do not explicitly set the file/directory permissions can lead to information disclosure. Of note, this does not impact modern MacOS Operating Systems. The method "File.createTempFile" on unix-like systems creates a random file, but, by default will create this file with the permissions "-rw-r--r--". Thus, if sensitive information is written to this file, other local users can read this information. This is the case in netty's "AbstractDiskHttpData" is vulnerable. This has been fixed in version 4.1.59.Final. As a workaround, one may specify your own "java.io.tmpdir" when you start the JVM or use "DefaultHttpDataFactory.setBaseDir(...)" to set the directory to something that is only readable by the current user.

    Source: redhat_csaf, BSI CSAF, BSI WID Portal, Debian Security Advisories, 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 products
    Affected versionsFixed in
    nettynetty
    • < 4.1.59.Final
    • < 4.1.59
    • 4.1.59.Final
    • 4.1.59
    netappactive_iq_unified_manager
    • —
    • —
    netappcloud_secure_agent
    • —
    • —
    netappsnapcenter
    • —
    • —
    oraclebanking_corporate_lending_process_management
    • 14.5.0
    • 14.2.0
    • 14.3.0
    • —
    • —
    • —
    oraclebanking_credit_facilities_process_management
    • 14.3.0
    • 14.5.0
    • 14.2.0
    • —
    • —
    • —
    oraclebanking_trade_finance_process_management
    • 14.5.0
    • 14.2.0
    • 14.3.0
    • —
    • —
    • —
    oraclecommunications_brm_-_elastic_charging_engine
    • 12.0.0.3
    • —
    oraclecommunications_design_studio
    • 7.4.2
    • —
    oraclecommunications_messaging_server
    • 8.1
    • —
    oraclenosql_database
    • < 20.3
    • 20.3
    quarkusquarkus
    • ≤ 1.13.7
    • —
    DellECS
    • < 3.8.1.0
    • 3.8.1.0

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebiandebian_linux10.0
    Linuxdebiandebian_linux9.0
    Linuxdebiannettybuster

    Weakness classes (CWE)

    • CWE-378Creation of Temporary File With Insecure Permissions

      Base

      Opening temporary files without appropriate measures or controls can leave the file, its contents and any function that it impacts vulnerable to attack.

      Entry at MITRE CWE-378
    • CWE-379Creation of Temporary File in Directory with Insecure Permissions

      Base

      The product creates a temporary file in a directory whose permissions allow unintended actors to determine the file's existence or otherwise access that file.

      Entry at MITRE CWE-379

    References & sources

    • github.comnetty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2web, x_refsource_CONFIRM
    • NVD (NIST)vuln/detail/CVE-2021-21290advisory
    • github.comnetty/netty/commit/c735357bf29d07856ad171c6611a2e1a0e0000ecweb, x_refsource_MISC
    • github.comnetty/nettypackage
    • lists.apache.orgthread.html/r7bb3cdc192e9a6f863d3ea05422f09fa1ae2b88d4663e63696…web
    • lists.apache.orgthread.html/r9924ef9357537722b28d04c98a189750b80694a19754e5057c…web
    • lists.apache.orgthread.html/ra0fc2b4553dd7aaf75febb61052b7f1243ac3a180a71c01f29…web
    • lists.apache.orgthread.html/ra503756ced78fdc2136bd33e87cb7553028645b261b1f5c618…web
    • lists.apache.orgthread.html/rb06c1e766aa45ee422e8261a8249b561784186483e8f742ea6…web
    • lists.apache.orgthread.html/rb51d6202ff1a773f96eaa694b7da4ad3f44922c40b3d4e1a19…web
    • lists.apache.orgthread.html/rb592033a2462548d061a83ac9449c5ff66098751748fcd1e2d…web
    • lists.apache.orgthread.html/rc0087125cb15b4b78e44000f841cd37fefedfda942fd7ddf3a…web
    • lists.apache.orgthread.html/rc488f80094872ad925f0c73d283d4c00d32def81977438e27a…web
    • lists.apache.orgthread.html/rcd163e421273e8dca1c71ea298dce3dd11b41d51c3a812e039…web
    • lists.apache.orgthread.html/rdba4f78ac55f803893a1a2265181595e79e3aa027e2e651dfb…web
    • lists.debian.org[debian-lts-announce] 20210211 [SECURITY] [DLA 2555-1] netty security updateweb, Mailing list, x_refsource_MLIST
    • security.netapp.comadvisory/ntap-20220210-0011web
    • debian.orgDSA-4885web, Vendor advisory, x_refsource_DEBIAN
    • oracle.comsecurity-alerts/cpujul2021.htmlweb, x_refsource_MISC
    • oracle.comsecurity-alerts/cpuApr2021.htmlweb, x_refsource_MISC

    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).

    1. Record modifiedGitHub

      Show 87 original changes
      Individual changes of this event as published by NVD
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      https://lists.apache.org/thread.html/rcd163e421273e8dca1c71ea298dce3dd11b41d51c3a812e0394e6a5d%40%3Ccommits.pulsar.apache.org%3E
      —
      Referenceremoved
      https://lists.apache.org/thread.html/rdba4f78ac55f803893a1a2265181595e79e3aa027e2e651dfba98c18%40%3Cjira.kafka.apache.org%3E
      —
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2021/02/msg00016.html
      —
      Referenceremoved
      https://security.netapp.com/advisory/ntap-20220210-0011/
      —
      Referenceremoved
      https://www.debian.org/security/2021/dsa-4885
      —
      Referenceremoved
      https://www.oracle.com//security-alerts/cpujul2021.html
      —
      Referenceremoved
      https://www.oracle.com/security-alerts/cpuApr2021.html
      —
      Referenceremoved
      https://www.oracle.com/security-alerts/cpuapr2022.html
      —
      Referenceremoved
      https://www.oracle.com/security-alerts/cpuoct2021.html
      —
      Reference typeremoved
      https://github.com/netty/netty/commit/c735357bf29d07856ad171c6611a2e1a0e0000ec Types: Patch, Third Party Advisory
      —
      Reference typeremoved
      https://github.com/netty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2 Types: Exploit, Third Party Advisory
      —
      Reference typeremoved
      https://lists.debian.org/debian-lts-announce/2021/02/msg00016.html Types: Mailing List, Third Party Advisory
      —
      Reference typeremoved
      https://security.netapp.com/advisory/ntap-20220210-0011/ Types: Third Party Advisory
      —
      Reference typeremoved
      https://www.debian.org/security/2021/dsa-4885 Types: Third Party Advisory
      —
      Reference typeremoved
      https://www.oracle.com//security-alerts/cpujul2021.html Types: Third Party Advisory
      —
      Reference typeremoved
      https://www.oracle.com/security-alerts/cpuApr2021.html Types: Patch, Third Party Advisory
      —
      Reference typeremoved
      https://www.oracle.com/security-alerts/cpuapr2022.html Types: Patch, Third Party Advisory
      —
      Reference typeremoved
      https://www.oracle.com/security-alerts/cpuoct2021.html Types: Patch, Third Party Advisory
      —

      Source identifier: security-advisories@github.com

    2. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: no

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2021-21290","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-08T21:11:03.460397Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    3. Record modifiedCVE Program

      Show 87 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://github.com/netty/netty/commit/c735357bf29d07856ad171c6611a2e1a0e0000ec
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      —
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      Referenceadded
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      —
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      —
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      https://lists.apache.org/thread.html/r7bb3cdc192e9a6f863d3ea05422f09fa1ae2b88d4663e63696ee7ef5%40%3Cdev.ranger.apache.org%3E
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      —
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      —
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      —
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      Referenceadded
      —
      https://lists.debian.org/debian-lts-announce/2021/02/msg00016.html
      Referenceadded
      —
      https://security.netapp.com/advisory/ntap-20220210-0011/
      Referenceadded
      —
      https://www.debian.org/security/2021/dsa-4885
      Referenceadded
      —
      https://www.oracle.com//security-alerts/cpujul2021.html
      Referenceadded
      —
      https://www.oracle.com/security-alerts/cpuApr2021.html
      Referenceadded
      —
      https://www.oracle.com/security-alerts/cpuapr2022.html
      Referenceadded
      —
      https://www.oracle.com/security-alerts/cpuoct2021.html
      Referenceremoved
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      —
      Referenceremoved
      https://github.com/netty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2
      —
      Referenceremoved
      https://lists.apache.org/thread.html/r0053443ce19ff125981559f8c51cf66e3ab4350f47812b8cf0733a05%40%3Cdev.kafka.apache.org%3E
      —
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      —
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      —
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      —
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      —
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      —
      Referenceremoved
      https://lists.apache.org/thread.html/r2936730ef0a06e724b96539bc7eacfcd3628987c16b1b99c790e7b87%40%3Cissues.zookeeper.apache.org%3E
      —
      Referenceremoved
      https://lists.apache.org/thread.html/r2fda4dab73097051977f2ab818f75e04fbcb15bb1003c8530eac1059%40%3Cjira.kafka.apache.org%3E
      —
      Referenceremoved
      https://lists.apache.org/thread.html/r326ec431f06eab7cb7113a7a338e59731b8d556d05258457f12bac1b%40%3Cdev.kafka.apache.org%3E
      —
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      —
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      —
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      —
      Referenceremoved
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      —
      Referenceremoved
      https://lists.apache.org/thread.html/r5c701840aa2845191721e39821445e1e8c59711e71942b7796a6ec29%40%3Cusers.activemq.apache.org%3E
      —
      Referenceremoved
      https://lists.apache.org/thread.html/r5e4a540089760c8ecc2c411309d74264f1dad634ad93ad583ca16214%40%3Ccommits.kafka.apache.org%3E
      —
      Referenceremoved
      https://lists.apache.org/thread.html/r5e66e286afb5506cdfe9bbf68a323e8d09614f6d1ddc806ed0224700%40%3Cjira.kafka.apache.org%3E
      —
      Referenceremoved
      https://lists.apache.org/thread.html/r71dbb66747ff537640bb91eb0b2b24edef21ac07728097016f58b01f%40%3Ccommits.kafka.apache.org%3E
      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
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      —
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2021/02/msg00016.html
      —
      Referenceremoved
      https://security.netapp.com/advisory/ntap-20220210-0011/
      —
      Referenceremoved
      https://www.debian.org/security/2021/dsa-4885
      —
      Referenceremoved
      https://www.oracle.com//security-alerts/cpujul2021.html
      —
      Referenceremoved
      https://www.oracle.com/security-alerts/cpuApr2021.html
      —
      Referenceremoved
      https://www.oracle.com/security-alerts/cpuapr2022.html
      —
      Referenceremoved
      https://www.oracle.com/security-alerts/cpuoct2021.html
      —
      Reference typeremoved
      https://github.com/netty/netty/commit/c735357bf29d07856ad171c6611a2e1a0e0000ec Types: Patch, Third Party Advisory
      —
      Reference typeremoved
      https://github.com/netty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2 Types: Exploit, Third Party Advisory
      —
      Reference typeremoved
      https://lists.debian.org/debian-lts-announce/2021/02/msg00016.html Types: Mailing List, Third Party Advisory
      —
      Reference typeremoved
      https://security.netapp.com/advisory/ntap-20220210-0011/ Types: Third Party Advisory
      —
      Reference typeremoved
      https://www.debian.org/security/2021/dsa-4885 Types: Third Party Advisory
      —
      Reference typeremoved
      https://www.oracle.com//security-alerts/cpujul2021.html Types: Third Party Advisory
      —
      Reference typeremoved
      https://www.oracle.com/security-alerts/cpuApr2021.html Types: Patch, Third Party Advisory
      —
      Reference typeremoved
      https://www.oracle.com/security-alerts/cpuapr2022.html Types: Patch, Third Party Advisory
      —
      Reference typeremoved
      https://www.oracle.com/security-alerts/cpuoct2021.html Types: Patch, Third Party Advisory
      —

      Source identifier: af854a3a-2127-422b-91ae-364da2661108

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