CVE-2021-29921

Advisory lineage Upstream: 0 Downstream: 13
Modified
Published: 06 May 2021, 00:00
Last modified:03 Nov 2025, 21:44

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (nvd)
EPSS Score
2.05% LOW
2% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
2 found
Dark Web
Not detected

Timeline

06 May 2021, 00:00
Published
Vulnerability first disclosed
03 Nov 2025, 21:44
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • v2.0•HIGH•Score: 7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 2.05%• Percentile: 84%

Affected Systems

  • oracle•communications_cloud_native_core_automated_test_suite

    1.8.0

  • oracle•communications_cloud_native_core_binding_support_function

    1.11.0

  • oracle•communications_cloud_native_core_network_slice_selection_function

    1.8.0

  • oracle•graalvm

    20.3.2 | 21.1.0

  • oracle•zfs_storage_appliance_kit

    8.8

  • python•python

    ≥ 3.8.0, < 3.8.12 | ≥ 3.9.0, < 3.9.5

References (17)