CVE-2025-54574: Squid's URN Handling can lead to Buffer Overflow
Published Aug 1, 2025
·Updated
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.
Affected Software
2 affected components
Squid Squid<6.4
Squid-Cache Squid<6.4
Remediation
Event History
Aug 1, 2025
CVE Published
via MITRE·06:02 PM
Data Sourced
via MITRE·06:02 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·06:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
Data Sourced
via Red Hat·07:01 PM
DescriptionSeverityAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2025-54574?
CVE-2025-54574 is rated as a high severity vulnerability due to its potential for remote code execution.
2
How do I fix CVE-2025-54574?
To fix CVE-2025-54574, upgrade to Squid version 6.4 or later.
3
What versions of Squid are affected by CVE-2025-54574?
CVE-2025-54574 affects Squid versions 6.3 and below.
4
Can CVE-2025-54574 be exploited remotely?
Yes, CVE-2025-54574 can be exploited remotely due to a heap buffer overflow.
5
What is a possible workaround for CVE-2025-54574?
A possible workaround for CVE-2025-54574 is to disable URN processing in Squid.