Denial of Service Vulnerability in c-ares Library by c-ares
CVE-2025-62408

5.9MEDIUM

Key Information:

Vendor

C-ares

Status
C-ares
Vendor
CVE Published:
8 December 2025

What is CVE-2025-62408?

The c-ares library is an asynchronous resolver used widely in various applications. Versions 1.32.3 to 1.34.5 have a fault in their read_answer() and process_answer() functions, causing them to terminate a query prematurely after the maximum number of attempts. This behavior can lead to a Denial of Service, making the application susceptible to interruptions. Users are encouraged to upgrade to version 1.34.6 or later to mitigate this issue.

Affected Version(s)

c-ares > 1.32.3, < 1.34.6

References

https://github.com/c-ares/c-ares/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/c-ares/c-ares/commit/714bf5675c541bd1e...
x_refsource_MISC

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-62408 : Denial of Service Vulnerability in c-ares Library by c-ares