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 squid-migration-scriptUpgrade squidUpgrade squid-sysvinit | Sep 30, 2025 | Aug 1, 2025 |
| Redhat_linux | — | No solution existsUpgrade squid-debugsourceUpgrade libecap-debugsourceUpgrade squid-debuginfoUpgrade squid-migration-scriptUpgrade squidUpgrade libecap-debuginfoUpgrade libecapUpgrade squid-sysvinitUpgrade libecap-devel | Aug 4, 2025 | Aug 1, 2025 |
| Rocky_linux | — | Upgrade libecap-debugsourceUpgrade libecap-debuginfoUpgrade libecapUpgrade libecap-devel | Mar 20, 2026 | Dec 6, 2023 |
| Ubuntu | — | Upgrade squid | Aug 7, 2025 | Aug 1, 2025 |
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