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CVE-2025-54574

Squid's URN Handling can lead to Buffer Overflow

Published: Aug 1, 2025Updated: Nov 5, 2025 Sources: CVE List NVD BDUCWE-122
9.3CRITICAL
NVD MITRE
EPSS Score
23.5%
Top 2.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:NI:LA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-122CWE-787

Affected Products

squid-cache
oss-projectaka squid, squid cache
squidOn-premNetwork Device
Networking Infrastructure / load-balancer-proxy
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
Astra Linux Special EditionOn-premOS
Operating Systems / linux-distro
АО «НТЦ ИТ РОСА»
commercial·RU
РОСА КобальтOn-prem
Operating Systems / linux-distro
Squid Software Foundation
oss-project
SquidOn-premNetwork Device
Networking Infrastructure / load-balancer-proxy

Exploitability

Official Patch Available
Workaround Available
Scannable·OpenVAS
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3
github.com
https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988
github.com
https://github.com/squid-cache/squid/releases/tag/SQUID_6_4
github.com
and 7 more references View all →
News mentions
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