CVE-2021-29921 : faille critique python python (CVSS 9.8)

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.

Sévérité

Critique (CVSS 9.8)

Vecteur CVSS

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation active

Non signalée par la CISA

Publication

6 mai 2021

Dernière mise à jour

17 juin 2026

• python python
• oracle communications cloud native core automated test suite
• oracle communications cloud native core binding support function
• oracle communications cloud native core network slice selection function
• oracle graalvm
• oracle zfs storage appliance kit

• Fiche CVE-2021-29921 sur le NVD (NIST)
• bugs.python.org/issue36384
• docs.python.org/3/library/ipaddress.html
• github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b…
• github.com/python/cpython/pull/12577
• github.com/python/cpython/pull/25099
• github.com/sickcodes
• github.com/sickcodes/security/blob/master/advisories/SICK…
• python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html
• security.gentoo.org/glsa/202305-02
• security.netapp.com/advisory/ntap-20210622-0003/
• sick.codes/sick-2021-014
• oracle.com//security-alerts/cpujul2021.html
• oracle.com/security-alerts/cpuapr2022.html
• oracle.com/security-alerts/cpujan2022.html
• oracle.com/security-alerts/cpujul2022.html