CVE-2021-41991: debian debian_linux Integer Overflow or Wraparound

Vulnerability summary

CVE-2021-41991 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in debian debian_linux. EPSS estimates a 5.30% chance of exploitation in the next 30 days, higher than 92.4% of scored vulnerabilities.

Timeline

1. 18-10-2021
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.

• CWE-190Integer Overflow or WraparoundThe 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.