Buffer overflow in Thekelleys Dnsmasq
CVE-2021-45951
Dnsmasq 2.86 has a heap-based buffer overflow in check_bad_address (called from check_for_bogus_wildcard and FuzzCheckForBogusWildcard). 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.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.027 (85.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.027 · change: +0.001
Affected products
- Thekelleys Dnsmasq — versions 2.86
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-924.yaml (Third Party Advisory)
- bugs.chromium.org/p/oss-fuzz/issues/detail (Exploit, Third Party Advisory, Issue Tracking)
- lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html (Mailing List, Third Party Advisory)
- lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-45951?
- CVE-2021-45951 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-2021-45951?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-45951 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.