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 Details
- CVSS 3.1 Base Score: 9.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade squidUpgrade squid-debugsourceUpgrade squid-debuginfo | Sep 9, 2025 | Aug 1, 2025 |
| Debian | — | Upgrade squid | Aug 4, 2025 | Aug 4, 2025 |
| Oracle_linux | — | Upgrade squidUpgrade squid-migration-scriptUpgrade squid-sysvinit | Sep 30, 2025 | Aug 1, 2025 |
| Redhat_linux | — | Upgrade squid-sysvinitUpgrade libecap-debuginfoUpgrade libecapUpgrade libecap-develUpgrade squid-migration-scriptUpgrade squidNo solution existsUpgrade squid-debuginfoUpgrade squid-debugsourceUpgrade libecap-debugsource | Aug 4, 2025 | Aug 1, 2025 |
| Rocky_linux | — | Upgrade libecap-develUpgrade libecap-debugsourceUpgrade libecapUpgrade libecap-debuginfo | Mar 20, 2026 | Dec 6, 2023 |
| Ubuntu | — | Upgrade squid | Aug 7, 2025 | Aug 1, 2025 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub