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CVE Record

CVE-2021-45954: Dnsmasq 2.86 has a heap-based buffer overflow in extract_name (called from answer_auth and FuzzAuth).

Dnsmasq 2.86 has a heap-based buffer overflow in extract_name (called from answer_auth and FuzzAuth). 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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-45954 describes a reported heap buffer overflow in dnsmasq 2.86 found through fuzzing. Business urgency is unclear because the vendor stated this CVE group does not represent real vulnerabilities to their knowledge, and the provided sources show no confirmed exploitation or scored severity.

Executive priority

Treat as monitoring and inventory work, not an emergency, unless your environment exposes dnsmasq 2.86 and a vendor confirms impact.

Technical view

The CVE text names a heap-based buffer overflow in dnsmasq 2.86 extract_name, reachable from answer_auth and FuzzAuth. The record has no CVSS, CWE, CPE, or confirmed affected-product metadata. Vendor discussion disputes practical vulnerability status for CVE-2021-45951 through CVE-2021-45957.

Likely exposure

Potentially relevant only where dnsmasq 2.86 is present. The source bundle does not establish affected CPEs, vulnerable configurations, reachable attack surface, or downstream distribution impact.

Exploitation context

No source in the bundle supports active exploitation, and the CVE is not in KEV. Available evidence points to an OSS-Fuzz-origin finding plus vendor discussion disputing real-world vulnerability status.

Researcher notes

Evidence is incomplete and contested. Focus analysis on the OSS-Fuzz record, Chromium issue, and dnsmasq-discuss vendor responses. Avoid assuming exploitability, affected configurations, or remediation beyond vendor guidance.

Mitigation direction

  • Inventory systems and appliances that include dnsmasq 2.86.
  • Check dnsmasq and distribution vendor guidance before applying CVE-specific remediation.
  • Prefer maintained vendor packages over unmanaged embedded copies.
  • Review whether dnsmasq services are unnecessarily exposed to untrusted networks.

Validation and detection

  • Confirm installed dnsmasq versions across servers, containers, appliances, and firmware.
  • Check vendor advisories or package changelogs for CVE-2021-45954 handling.
  • Record KEV status as not listed based on the provided bundle.
  • Document any externally reachable dnsmasq deployments for risk review.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-45954 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.