Medium severity · published Dec 8, 2025
CVE-2025-62408
c-ares has a Use After Free vulnerability when connection is cleaned up after error
5.9
CVSS
0.4%
EPSS
No
On KEV
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
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CA
c-ares · c-ares
> 1.32.3, < 1.34.6 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-62408
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-62408
Patch
https://github.com/c-ares/c-ares/commit/714bf5675c541bd1e668a8db8e67ce012651e618
Patch
https://github.com/c-ares/c-ares/security/advisories/GHSA-jq53-42q6-pqr5
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