CVE-2020-36242

Aliases:GHSA-rhm9-p9w5-fwm7PYSEC-2021-63
Advisory lineage Upstream: 0 Downstream: 20
Modified
Published: 07 Feb 2021, 19:50
Last modified:04 Aug 2024, 17:23

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.1 CRITICAL
v3.1 (nvd)
EPSS Score
1.57% LOW
2% probability +0.30%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

07 Feb 2021, 19:50
Published
Vulnerability first disclosed
04 Aug 2024, 17:23
Last Modified
Vulnerability information updated

Description

In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.

CVSS Metrics

  • v4.0•HIGH•Score: 8.8CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
  • v3.1•CRITICAL•Score: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
  • v2.0•MEDIUM•Score: 6.4AV:N/AC:L/Au:N/C:P/I:N/A:P

EPSS Trends

Current EPSS score: 1.57%• Percentile: 82%

Techniques & Countermeasures

  • CWE-190•Integer Overflow or Wraparound

    The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • cryptography.io•cryptography

    < 3.3.2

  • fedoraproject•fedora

    33

  • oracle•communications_cloud_native_core_network_function_cloud_native_environment

    1.10.0

  • PyPI•cryptography

    ≥ 3.1, < 3.3.2

References (15)