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CVE-2025-62408

c-ares has a Use After Free vulnerability when connection is cleaned up after error

Published: Dec 8, 2025Updated: Feb 2, 2026 Sources: CVE List NVD BDUCWE-416
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.4%
Top 69.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum attempts when using read_answer() and process_answer(), which can cause a Denial of Service. This issue is fixed in version 1.34.6.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-416

Affected Products

Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Red Hat Hardened ImagesRed Hat Inc.
On-prem
Operating Systems / linux-distro
c-aresСообщество свободного программного обеспечения
On-prem
Operating Systems / linux-distro
c-aresc-ares
Library
OSS Libraries / generic-library
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ооо «ред софт»commercialRUOperating Systemsaka red soft
red hat inc.commercialUSOperating Systemsaka red hat
c-aresoss-projectOSS Libraries

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/c-ares/c-ares/commit/714bf5675c541bd1e668a8db8e67ce012651e618
github.com
https://github.com/c-ares/c-ares/security/advisories/GHSA-jq53-42q6-pqr5
github.com
https://redos.red-soft.ru/search/?iblock_id=24&q=CVE-2025-62408
redos.red-soft.ru
and 4 more references View all →

Timeline

Published
Dec 8, 2025
Last Updated
Feb 2, 2026

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