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.
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Mon, 03 Nov 2025 22:30:00 +0000
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Status: PUBLISHED
Assigner: mitre
Published: 2021-05-06T00:00:00.000Z
Updated: 2025-11-03T21:44:43.122Z
Reserved: 2021-04-01T00:00:00.000Z
Link: CVE-2021-29921
No data.
Status : Modified
Published: 2021-05-06T13:15:12.573
Modified: 2025-11-03T22:15:48.057
Link: CVE-2021-29921