CVE-2025-54574— Squid's URN Handling can lead to Buffer Overflow
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2025-54574
Vulnerability Information
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Vulnerability Title
Squid's URN Handling can lead to Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Squid 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Squid是Squid开源的一套代理服务器和Web缓存服务器软件。该软件提供缓存万维网、过滤流量、代理上网等功能。 Squid 6.3及之前版本存在安全漏洞，该漏洞源于处理URN时存在堆缓冲区溢出，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| squid-cache | squid | < 6.4 | - |
II. Public POCs for CVE-2025-54574
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | CVE-2025-54574 | https://github.com/B1ack4sh/Blackash-CVE-2025-54574 | POC Details |
| 2 | Vulnerability Found on Squid Proxy. | https://github.com/starrynightsecurity/CVE-2025-54574-Squid-Heap-Buffer-Overflow | POC Details |
| 3 | CVE-2025-54574 | https://github.com/Ashwesker/Blackash-CVE-2025-54574 | POC Details |
| 4 | CVE-2025-54574 | https://github.com/Ashwesker/Ashwesker-CVE-2025-54574 | POC Details |
| 5 | CVE-2025-54574 | https://github.com/gmh5225/Blackash-CVE-2025-54574 | POC Details |
AI-Generated POCVerified env Premium
Reproduced successfully in a real sandbox· Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker:
VULNERABLE: Squid survived URN exploit attemptsReproduction recording is a Pro+ exclusive
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III. Intelligence Information for CVE-2025-54574
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IV. Related Vulnerabilities
Same product: squid
- CVE-2026-47729
Squid: Memory disclosure in FTP gateway - CVE-2026-50012
Squid: Memory corruption in cache_digest reply handling - CVE-2026-33526
Squid vulnerable to Denial of Service in ICP Request handlin - CVE-2026-33515
Squid has issues in ICP message handling - CVE-2026-32748
Squid has Denial of Service in ICP Response handling
Same vendor: squid-cache
- CVE-2026-47729
Squid: Memory disclosure in FTP gateway - CVE-2026-50012
Squid: Memory corruption in cache_digest reply handling - CVE-2026-33526
Squid vulnerable to Denial of Service in ICP Request handlin - CVE-2026-33515
Squid has issues in ICP message handling - CVE-2026-32748
Squid has Denial of Service in ICP Response handling
V. Comments for CVE-2025-54574
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