CVE-2025-54574

criticalpriority · attend · 57EPSS 0.240 · 98 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · PoC

Likely / severe?

24.0% (98th) EPSS

CVSS 9.8 · critical

Is it mine?

13 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.3criticalAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Hsecondary · FSTEC (BDU) RU

v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Hsecondary · ENISA EU

v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Hsecondary · security-advisories@github.comexploitability 3.9 · impact 4.7

v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-122USCWE-122US

exploits (2)

Public proof-of-concept and weaponised exploit code.

gmh5225/Blackash-CVE-2025-54574CVE-2025-54574PoC · poc_in_github
starrynightsecurity/CVE-2025-54574-Squid-Heap-Buffer-OverflowVulnerability Found on Squid Proxy.PoC · poc_in_github

affected products (13)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Open Source Squid <6.4all versionscert_bundDE
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Open Source Squid< 6.4cert_bundDE
squid-cache squid≤ < 6.4enisa_euvdEU
Squid Software Foundation Squid≤ 6.4fstec_bduRU
АО «НТЦ ИТ РОСА» РОСА Кобальт≤ 7.9fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.3fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 4.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.8fstec_bduRU
squid-cache squid< 6.4nvdUScpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1696Squid: Schwachstelle ermöglicht CodeausführungDeutsch2025-07-31csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Squid ausnutzen, um beliebigen Programmcode auszuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd NVD CVE.org MITRE

published 2025-08-01modified 2026-06-17

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+16120 more

references (13)

External citations — patches, advisories, analysis.

scry

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