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.

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2021-29921 · Microsoft / collected KEV context

cve-program · CVE-2021-29921

• https://github.com/sickcodes
• https://docs.python.org/3/library/ipaddress.html
• https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst
• https://sick.codes/sick-2021-014
• https://www.oracle.com//security-alerts/cpujul2021.html
• https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md
• https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html
• https://bugs.python.org/issue36384
• https://github.com/python/cpython/pull/12577
• https://github.com/python/cpython/pull/25099
• https://security.netapp.com/advisory/ntap-20210622-0003/
• https://www.oracle.com/security-alerts/cpuoct2021.html
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://security.gentoo.org/glsa/202305-02

No related operational record is retained in the current change model.