CVE-2021-29921

CRITICAL

9.8

Description

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published5/6/2021

Last Modified11/3/2025

Sourcenvd

Honeypot Sightings0

Affected Products

oracle:communications_cloud_native_core_automated_test_suiteoracle:communications_cloud_native_core_binding_support_functionoracle:communications_cloud_native_core_network_slice_selection_functionoracle:graalvmoracle:zfs_storage_appliance_kitpython:python

References

https://bugs.python.org/issue36384(cve@mitre.org)

https://docs.python.org/3/library/ipaddress.html(cve@mitre.org)

https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst(cve@mitre.org)

https://github.com/python/cpython/pull/12577(cve@mitre.org)

https://github.com/python/cpython/pull/25099(cve@mitre.org)

https://github.com/sickcodes(cve@mitre.org)

https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md(cve@mitre.org)

https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html(cve@mitre.org)

https://security.gentoo.org/glsa/202305-02(cve@mitre.org)

https://security.netapp.com/advisory/ntap-20210622-0003/(cve@mitre.org)

https://sick.codes/sick-2021-014(cve@mitre.org)

https://www.oracle.com//security-alerts/cpujul2021.html(cve@mitre.org)

https://www.oracle.com/security-alerts/cpuapr2022.html(cve@mitre.org)

https://www.oracle.com/security-alerts/cpujan2022.html(cve@mitre.org)

https://www.oracle.com/security-alerts/cpujul2022.html(cve@mitre.org)

https://www.oracle.com/security-alerts/cpuoct2021.html(cve@mitre.org)

https://bugs.python.org/issue36384(af854a3a-2127-422b-91ae-364da2661108)

https://docs.python.org/3/library/ipaddress.html(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/python/cpython/blob/63298930fb531ba2bb4f23bc3b915dbf1e17e9e1/Misc/NEWS.d/3.8.0a4.rst(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/python/cpython/pull/12577(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/python/cpython/pull/25099(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/sickcodes(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-014.md(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html(af854a3a-2127-422b-91ae-364da2661108)

https://python-security.readthedocs.io/vuln/ipaddress-ipv4-leading-zeros.html(af854a3a-2127-422b-91ae-364da2661108)

https://security.gentoo.org/glsa/202305-02(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20210622-0003/(af854a3a-2127-422b-91ae-364da2661108)

https://sick.codes/sick-2021-014(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com//security-alerts/cpujul2021.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com/security-alerts/cpuapr2022.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com/security-alerts/cpujan2022.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com/security-alerts/cpujul2022.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com/security-alerts/cpuoct2021.html(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.