CVE-2021-45951: thekelleys dnsmasq Out-of-bounds Write

Vulnerability summary

CVE-2021-45951 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in thekelleys dnsmasq. EPSS estimates a 2.52% chance of exploitation in the next 30 days, higher than 84.6% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 31-12-2021
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

Dnsmasq 2.86 has a heap-based buffer overflow in check_bad_address (called from check_for_bogus_wildcard and FuzzCheckForBogusWildcard). NOTE: the vendor's position is that CVE-2021-45951 through CVE-2021-45957 "do not represent real vulnerabilities, to the best of our knowledge.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.