CVE-2023-32067 HIGH

CVE-2023-32067: 0-byte UDP payload DoS in c-ares

Vendor C-Ares
Product c-ares
Weakness CWE-400
Published May 25, 2023
Last update February 13, 2025
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.

Key dates

02Disclosure timeline

May 25, 2023 CVE published
February 13, 2025 Record updated