CVE-2021-45956

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Dnsmasq 2.86 has a heap-based buffer overflow in print_mac (called from log_packet and dhcp_reply). 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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-787

Affected software

Vendor	Product	Versions
n/a	n/a	n/a
thekelleys	dnsmasq	2.86

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35887Exploit, Issue Tracking, Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-933.yamlThird Party Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.htmlMailing List, Third Party Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.htmlMailing List, Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35887Exploit, Issue Tracking, Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-933.yamlThird Party Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.htmlMailing List, Third Party Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.htmlMailing List, Third Party Advisory

Timeline

Published: Jan 1, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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