What’s Vulnerable › Vulnerabilities
CVE-2021-45955
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.6% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2022-01-01 · updated 2026-06-17
- Weakness: CWE-787
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
Affected products
- Simon Kelley dnsmasq: 2.86
References
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35898
- https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-932.yaml
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35898
- https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-932.yaml
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html
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