9.3
CRITICAL
CVE-2025-54574
Squid Heap Buffer Overflow (Remote Code Execution)
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.

INFO

Published Date :

Aug. 1, 2025, 6:15 p.m.

Last Modified :

Aug. 4, 2025, 3:06 p.m.

Remotely Exploitable :

Yes !

Impact Score :

4.7

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2025-54574 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2025-54574 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Squid-cache squid
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-54574.

URL Resource
https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988
https://github.com/squid-cache/squid/releases/tag/SQUID_6_4
https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

CVE-2025-54574

Shell

Updated: 1 day, 7 hours ago
0 stars 0 fork 0 watcher
Born at : Aug. 4, 2025, 2:59 p.m. This repo has been linked 1 different CVEs too.

监控Github最新网络安全相关的仓库...

cve cybersecurity github spider

Shell Python Nix

Updated: 22 hours, 56 minutes ago
12 stars 4 fork 4 watcher
Born at : May 9, 2025, 2:29 p.m. This repo has been linked 23 different CVEs too.

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 1 day, 1 hour ago
7147 stars 1193 fork 1193 watcher
Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 821 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-54574 vulnerability anywhere in the article.

  • CybersecurityNews
Critical Squid Vulnerability Let Attackers Execute Remote Code

A critical security vulnerability has been discovered in Squid Web Proxy Cache that enables attackers to execute remote code through a heap buffer overflow in URN (Uniform Resource Name) handling. The ... Read more

Published Date: Aug 04, 2025 (1 day, 11 hours ago)
  • Daily CyberSecurity
Critical Squid Vulnerability (CVE-2025-54574) Allows Remote Code Execution & Data Leakage

The Squid Project has issued an urgent advisory for CVE-2025-54574 (CVSS 9.3), a heap buffer overflow bug affecting Squid’s handling of URN (Uniform Resource Name) responses. “Due to incorrect buffer ... Read more

Published Date: Aug 04, 2025 (1 day, 22 hours ago)

The following table lists the changes that have been made to the CVE-2025-54574 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by [email protected]

    Aug. 01, 2025

    Action Type Old Value New Value
    Added 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.
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
    Added CWE CWE-122
    Added Reference https://github.com/squid-cache/squid/commit/a27bf4b84da23594150c7a86a23435df0b35b988
    Added Reference https://github.com/squid-cache/squid/releases/tag/SQUID_6_4
    Added Reference https://github.com/squid-cache/squid/security/advisories/GHSA-w4gv-vw3f-29g3
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-54574 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-54574 weaknesses.

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability