What is CVE-2021-45957?

CVE-2021-45957 is a critical-severity vulnerability in Thekelleys Dnsmasq, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-01-01.

How severe is CVE-2021-45957?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-45957 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Thekelleys Dnsmasq

CVE-2021-45957

Dnsmasq 2.86 has a heap-based buffer overflow in answer_request (called from FuzzAnswerTheRequest and fuzz_rfc1035.c). NOTE: the vendor's position is that CVE-2021-45951 through CVE-2021-45957 "do not represent real vulnerabilities, to the…

Vulnerability class: Buffer Overflow

EPSS: 0.024 (82.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Thekelleys Dnsmasq — versions 2.86
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC, Issue Tracking)
cve@mitre.org (Mailing List, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Mailing List, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-45957?: CVE-2021-45957 is a critical-severity vulnerability in Thekelleys Dnsmasq, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-01-01.
How severe is CVE-2021-45957?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-45957 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.