CVE-2021-29921: Oracle Communications Cloud Native Core Automated Test Suite

Critical severity, CVSS 9.8. EPSS: 6.9% chance of exploitation in the next 30 days.

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 products

• Oracle Communications Cloud Native Core Automated Test Suite: version 1.8.0 only
• Oracle Communications Cloud Native Core Binding Support Function: version 1.11.0 only
• Oracle Communications Cloud Native Core Network Slice Selection Function: version 1.8.0 only
• Oracle Graalvm: version 20.3.2 only; version 21.1.0 only
• Oracle ZFS Storage Appliance Kit: version 8.8 only
• Python Python: from 3.8.0, before 3.8.12 (fixed in 3.8.12); from 3.9.0, before 3.9.5 (fixed in 3.9.5)

Published 2021-05-06. Last modified 2026-10-08.