CVE-2021-45953

CRITICAL
Published Jan 1, 20224y ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Jan 1, 2022 4y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 1

VendorProductVersionRange
thekelleysdnsmasq2.86any

References 4

  • bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35858
    ExploitIssue TrackingThird Party Advisory
  • github.com https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-929.yaml
    Third Party Advisory
  • lists.thekelleys.org.uk https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html
    Mailing ListThird Party Advisory
  • lists.thekelleys.org.uk https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html
    Mailing ListThird Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.