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Vulnerability · NVD

CVE-2021-29921

CVE-2021-29921, critical severity (CVSS 9.8): 3 tracked apps concerned, all fixed or indeterminable on their current version.

Severity (CVSS)
9.8

NVD scale

Exploitation
6.9 %

EPSS, predicted over 30 days

Tracked apps
3
Still exposed
0

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.

Attack vector : Network No privileges required No user interaction
Show raw CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS 6.88% above median percentile 93.9%

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

  • Python 3.12 Windows winget:Python.Python.3.12
    Affected ≥3.8.0 <3.8.12 Fixed in 3.8.12 Latest tracked 3.12.10 patched
  • Python 3.13 Windows winget:Python.Python.3.13
    Affected ≥3.8.0 <3.8.12 Fixed in 3.8.12 Latest tracked 3.13.15 patched
  • Python 3.14 Windows winget:Python.Python.3.14
    Affected ≥3.8.0 <3.8.12 Fixed in 3.8.12 Latest tracked 3.14.7 patched

NVD references 6 distinct products for this CVE : only those tracked by Scout (mobile and desktop catalog apps) are listed above. Libraries, servers and out-of-scope products do not appear here. Full list on NVD ↗

Vulnerable CPE configurations (2)
Vendor Product Versions
python python
All platforms (wildcard)
 ≥3.8.0 <3.8.12
python python
All platforms (wildcard)
 ≥3.9.0 <3.9.5
View on NVD ↗ Advisory · bugs.python.org Advisory · docs.python.org Advisory · python-security.readthedocs.io

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