CVE-2025-54574 CRITICAL

CVE-2025-54574: Squid's URN Handling can lead to Buffer Overflow

Vendor Squid-Cache
Product squid
Weakness CWE-122
Published August 1, 2025
Last update November 5, 2025
View on NVD All CVEs

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Squid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow and possible remote code execution attack when processing URN due to incorrect buffer management. This has been fixed in version 6.4. To work around this issue, disable URN access permissions.

Key dates

02Disclosure timeline

August 1, 2025 CVE published
November 5, 2025 Record updated