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-debuginfoUpgrade squid-debugsource | 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 | — | No solution existsUpgrade squid-debugsourceUpgrade squid-debuginfoUpgrade libecap-debugsourceUpgrade squid-sysvinitUpgrade squid-migration-scriptUpgrade squidUpgrade libecap-debuginfoUpgrade libecap-develUpgrade libecap | Aug 4, 2025 | Aug 1, 2025 |
| Rocky_linux | — | Upgrade libecap-develUpgrade libecap-debugsourceUpgrade libecap-debuginfoUpgrade libecap | Mar 20, 2026 | Dec 6, 2023 |
| Ubuntu | — | Upgrade squid | Aug 7, 2025 | Aug 1, 2025 |
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