CVE-2021-29921 The advisory has been revoked - it doesn't affect any version of package python39-devel:3.9/python39-Cython (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ALMALINUX8-PYTHON39DEVEL-5642143
- published28 May 2023
- disclosed9 Nov 2021
Introduced: 9 Nov 2021
CVE-2021-29921 (opens in a new tab)Amendment
The AlmaLinux security team deemed this advisory irrelevant for AlmaLinux:8.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python39-devel:3.9/python39-Cython package and not the python39-devel:3.9/python39-Cython package as distributed by AlmaLinux.
In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses.
References
- https://errata.almalinux.org/8/ALSA-2021-4160.html
- https://errata.almalinux.org/8/ALSA-2021-4162.html
- https://vulners.com/cve/CVE-2021-29921
- https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
- https://bugs.python.org/issue36384
- https://docs.python.org/3/library/ipaddress.html
- https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst
- https://github.com/python/cpython/pull/12577
- https://github.com/python/cpython/pull/25099
- https://github.com/sickcodes
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md
- https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html
- https://security.gentoo.org/glsa/202305-02
- https://security.netapp.com/advisory/ntap-20210622-0003/
- https://sick.codes/sick-2021-014
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.oracle.com/security-alerts/cpuoct2021.html