What’s Vulnerable › Vulnerabilities

CVE-2021-45953

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% 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 extract_name (called from hash_questions and fuzz_util.c). 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.

Affected products

• Simon Kelley dnsmasq: 2.86

References

• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35858
• https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-929.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=35858
• https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-929.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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