Python Software Foundation CPython: security vulnerability (CVE-2020-27619)
Published Last modified Sources: CVE.org, OSV
What is affected, what to do
In Python 3 through 3.9.0, the Lib/test/multibytecodec_support.py CJK codec tests call eval() on content retrieved via HTTP.
Update Python Software Foundation CPython to version 3.6.13, Python Software Foundation CPython to version 3.7.10, Python Software Foundation CPython to version 3.8.7.
- Affected
- Python Software Foundation CPython
lt 3.0.0..3.6.13 - Python Software Foundation CPython
lt 3.7.0..3.7.10 - Python Software Foundation CPython
lt 3.8.0..3.8.7 - Python Software Foundation CPython
lt 3.9.0..3.9.1 - Fedora
eq 33..33 - Fedora
eq 34..34 - Oracle Communications Cloud Native Core Network Function Cloud Native Environment
eq 22.2.0..22.2.0
- Python Software Foundation CPython
- Fixed in
- Python Software Foundation CPython
3.6.13 - Python Software Foundation CPython
3.7.10 - Python Software Foundation CPython
3.8.7 - Python Software Foundation CPython
3.9.1
- Python Software Foundation CPython
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Metrics
9.8
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
9.8
CVSS v3
Severity Critical on the scale from 0 to 10.
Source: CVE.org, OSV
8.3 %
EPSS score
Moderate — model estimates 1-10% exploitation likelihood.
Source: FIRST EPSS, percentile 94.9
Show all metrics
- Severity
- Critical
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- 121.06 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- 9.8 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- 9.8
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- 8.3 %
- 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- 94.9
- Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
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
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- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
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 Python 3 through 3.9.0, the Lib/test/multibytecodec_support.py CJK codec tests call eval() on content retrieved via HTTP.
Source: 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 | ||
|---|---|---|---|
| oracle | communications_cloud_native_core_network_function_cloud_native_environment |
|
|
| python | python |
|
|
Vendors and products
Affected operating systems
| Other | fedoraproject | fedora | 33 |
| Other | fedoraproject | fedora | 34 |
References & sources
- access.redhat.comsecurity/cve/CVE-2020-27619advisory
- bugs.python.orgissue41944report
- github.compython/cpython/commit/2ef5caa58febc8968e670e39e3d37cf8eef3cab8
- github.compython/cpython/commit/b664a1df4ee71d3760ab937653b10997081b1794
- github.compython/cpython/commit/6c6c256df3636ff6f6136820afaefa5a10a3ac33
- github.compython/cpython/commit/43e523103886af66d6c27cd72431b5d9d14cd2a9
- github.compython/cpython/commit/e912e945f2960029d039d3390ea08835ad39374b
- lists.apache.org[mina-dev] 20210225 [jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jarMailing list
- lists.fedoraproject.orgFEDORA-2021-98720f3785Vendor advisory
- lists.fedoraproject.orgFEDORA-2021-12df7f7382Vendor advisory
- lists.apache.org[bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8Mailing list
- lists.apache.org[bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8Mailing list
- oracle.comsecurity-alerts/cpujul2022.html
- security.netapp.comadvisory/ntap-20201123-0004
- security.gentoo.orgGLSA-202402-04Vendor advisory
- NVD (NIST)vuln/detail/CVE-2020-27619web
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 modifiedMITRE
New references:- https://bugs.python.org/issue41944
- https://github.com/python/cpython/commit/2ef5caa58febc8968e670e39e3d37cf8eef3cab8
- https://github.com/python/cpython/commit/43e523103886af66d6c27cd72431b5d9d14cd2a9
- https://github.com/python/cpython/commit/6c6c256df3636ff6f6136820afaefa5a10a3ac33
and 8 more references
Show 36 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://bugs.python.org/issue41944Reference added —https://github.com/python/cpython/commit/2ef5caa58febc8968e670e39e3d37cf8eef3cab8Reference added —https://github.com/python/cpython/commit/43e523103886af66d6c27cd72431b5d9d14cd2a9Reference added —https://github.com/python/cpython/commit/6c6c256df3636ff6f6136820afaefa5a10a3ac33Reference added —https://github.com/python/cpython/commit/b664a1df4ee71d3760ab937653b10997081b1794Reference added —https://github.com/python/cpython/commit/e912e945f2960029d039d3390ea08835ad39374bReference added —https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3EReference added —https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3EReference added —https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3EReference added —https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RSLQD5CCM75IZGAMBDGUZEATYU5YSGJ7/Reference added —https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGIY6I4YS3WOXAK4SXKIEOC2G4VZKIR7/Reference added —https://security.gentoo.org/glsa/202402-04Reference added —https://security.netapp.com/advisory/ntap-20201123-0004/Reference added —https://www.oracle.com/security-alerts/cpujul2022.htmlReference removed https://bugs.python.org/issue41944—Reference removed https://github.com/python/cpython/commit/2ef5caa58febc8968e670e39e3d37cf8eef3cab8—Reference removed https://github.com/python/cpython/commit/43e523103886af66d6c27cd72431b5d9d14cd2a9—Reference removed https://github.com/python/cpython/commit/6c6c256df3636ff6f6136820afaefa5a10a3ac33—Reference removed https://github.com/python/cpython/commit/b664a1df4ee71d3760ab937653b10997081b1794—Reference removed https://github.com/python/cpython/commit/e912e945f2960029d039d3390ea08835ad39374b—Reference removed https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E—Reference removed https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RSLQD5CCM75IZGAMBDGUZEATYU5YSGJ7/—Reference removed https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGIY6I4YS3WOXAK4SXKIEOC2G4VZKIR7/—Reference removed https://security.gentoo.org/glsa/202402-04—Reference removed https://security.netapp.com/advisory/ntap-20201123-0004/—Reference removed https://www.oracle.com/security-alerts/cpujul2022.html—Reference type removed https://bugs.python.org/issue41944 Types: Issue Tracking, Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/2ef5caa58febc8968e670e39e3d37cf8eef3cab8 Types: Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/43e523103886af66d6c27cd72431b5d9d14cd2a9 Types: Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/6c6c256df3636ff6f6136820afaefa5a10a3ac33 Types: Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/b664a1df4ee71d3760ab937653b10997081b1794 Types: Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/e912e945f2960029d039d3390ea08835ad39374b Types: Patch, Vendor Advisory—Reference type removed https://security.netapp.com/advisory/ntap-20201123-0004/ Types: Third Party Advisory—Reference type removed https://www.oracle.com/security-alerts/cpujul2022.html Types: Patch, Third Party Advisory—Source identifier: cve@mitre.org
Record modifiedCISA ADP
CISA assessment (SSVC): exploitation: none known, automatable: yes
Show the original change
Individual changes of this event as published by NVD Type Action Before After SSVC assessment added —{"id":"CVE-2020-27619","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-08T20:58:06.990708Z"}Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Record modifiedCVE Program
New references:- https://bugs.python.org/issue41944
- https://github.com/python/cpython/commit/2ef5caa58febc8968e670e39e3d37cf8eef3cab8
- https://github.com/python/cpython/commit/43e523103886af66d6c27cd72431b5d9d14cd2a9
- https://github.com/python/cpython/commit/6c6c256df3636ff6f6136820afaefa5a10a3ac33
and 8 more references
Show 36 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://bugs.python.org/issue41944Reference added —https://github.com/python/cpython/commit/2ef5caa58febc8968e670e39e3d37cf8eef3cab8Reference added —https://github.com/python/cpython/commit/43e523103886af66d6c27cd72431b5d9d14cd2a9Reference added —https://github.com/python/cpython/commit/6c6c256df3636ff6f6136820afaefa5a10a3ac33Reference added —https://github.com/python/cpython/commit/b664a1df4ee71d3760ab937653b10997081b1794Reference added —https://github.com/python/cpython/commit/e912e945f2960029d039d3390ea08835ad39374bReference added —https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3EReference added —https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3EReference added —https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3EReference added —https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RSLQD5CCM75IZGAMBDGUZEATYU5YSGJ7/Reference added —https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGIY6I4YS3WOXAK4SXKIEOC2G4VZKIR7/Reference added —https://security.gentoo.org/glsa/202402-04Reference added —https://security.netapp.com/advisory/ntap-20201123-0004/Reference added —https://www.oracle.com/security-alerts/cpujul2022.htmlReference removed https://bugs.python.org/issue41944—Reference removed https://github.com/python/cpython/commit/2ef5caa58febc8968e670e39e3d37cf8eef3cab8—Reference removed https://github.com/python/cpython/commit/43e523103886af66d6c27cd72431b5d9d14cd2a9—Reference removed https://github.com/python/cpython/commit/6c6c256df3636ff6f6136820afaefa5a10a3ac33—Reference removed https://github.com/python/cpython/commit/b664a1df4ee71d3760ab937653b10997081b1794—Reference removed https://github.com/python/cpython/commit/e912e945f2960029d039d3390ea08835ad39374b—Reference removed https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E—Reference removed https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E—Reference removed https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RSLQD5CCM75IZGAMBDGUZEATYU5YSGJ7/—Reference removed https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGIY6I4YS3WOXAK4SXKIEOC2G4VZKIR7/—Reference removed https://security.gentoo.org/glsa/202402-04—Reference removed https://security.netapp.com/advisory/ntap-20201123-0004/—Reference removed https://www.oracle.com/security-alerts/cpujul2022.html—Reference type removed https://bugs.python.org/issue41944 Types: Issue Tracking, Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/2ef5caa58febc8968e670e39e3d37cf8eef3cab8 Types: Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/43e523103886af66d6c27cd72431b5d9d14cd2a9 Types: Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/6c6c256df3636ff6f6136820afaefa5a10a3ac33 Types: Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/b664a1df4ee71d3760ab937653b10997081b1794 Types: Patch, Vendor Advisory—Reference type removed https://github.com/python/cpython/commit/e912e945f2960029d039d3390ea08835ad39374b Types: Patch, Vendor Advisory—Reference type removed https://security.netapp.com/advisory/ntap-20201123-0004/ Types: Third Party Advisory—Reference type removed https://www.oracle.com/security-alerts/cpujul2022.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-2020-27619"><img src="https://intel.neosec.eu/badge/cve/CVE-2020-27619.svg?lang=en" alt="CVE-2020-27619 – NEOSEC Intel" height="20"></a>