CVE-2021-45955: thekelleys dnsmasq Out-of-bounds Write

Vulnerability summary

CVE-2021-45955 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 resize_packet (called from FuzzResizePacket and fuzz_rfc1035.c) because of the lack of a proper bounds check upon pseudo header re-insertion. 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." However, a contributor states that a security patch (mentioned in 016162.html) is needed

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