CVE-2021-29921
Critical · CVSS 9.8- CVSS
- 9.8
- nvd
- EPSS
- —
- KEV
- No
- Class
- oss containerizable
- NVD-CWE-Other
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.
Affected packages
| Bitnami | libpython | 3.8.0 → 3.8.12 |
| Bitnami | libpython | 3.9.0 → 3.9.5 |
| Bitnami | python | 3.8.0 → 3.8.12 |
| Bitnami | python | 3.9.0 → 3.9.5 |
| Bitnami | python-min | 3.8.0 → 3.8.12 |
| Bitnami | python-min | 3.9.0 → 3.9.5 |
References
- 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
Status: profiled · ingested 2026-10-09T00:00:43.000Z