CVE-2021-45956

CRITICAL 9.8CVE-2021-45956 · Published 01/01/2022 · updated 17/06/2026

In short

CVE-2021-45956 is a CRITICAL (CVSS 9.8) vulnerability affecting dnsmasq (thekelleys).
Chance of exploitation in the next 30 days (EPSS): 2.7%, higher than 86.0% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
dnsmasq thekelleys	`= 2.86`	No fix yet

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.

References

bugs.chromium.org/p/oss-fuzz/issues/detail · Exploit
google/oss-fuzz-vulns · Third Party Advisory
lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html · Mailing List
lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html · Mailing List

More vulnerabilities in dnsmasq

See all →

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free

Package

Affected versions

Patched versions

dnsmasq

thekelleys

= 2.86

No fix yet

More vulnerabilities in dnsmasq

See all →