Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version 6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5. There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2
CVSS Details
- CVSS 3.1 Base Score: 5.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libecap-develUpgrade squidUpgrade libecap | Apr 15, 2024 | Feb 14, 2024 |
| Amazon Linux Ami 2 | — | Upgrade squidUpgrade squid-migration-scriptUpgrade squid-sysvinitUpgrade squid-debuginfo | Mar 5, 2024 | Feb 14, 2024 |
| Amazon_linux_2023 | — | Upgrade squidUpgrade squid-debuginfoUpgrade squid-debugsource | Feb 17, 2025 | Feb 14, 2024 |
| Centos_linux | — | Upgrade squid-sysvinitUpgrade squid-debuginfoUpgrade squidUpgrade squid-migration-script | Apr 12, 2024 | Feb 14, 2024 |
| Debian | — | Upgrade squid | Mar 11, 2024 | Feb 14, 2024 |
| Oracle_linux | — | Upgrade libecapUpgrade squid-migration-scriptUpgrade libecap-develUpgrade squid-sysvinitUpgrade squid | Mar 21, 2024 | Feb 14, 2024 |
| Redhat_linux | — | Upgrade squid-sysvinitUpgrade squid-debugsourceNo solution existsUpgrade libecap-develUpgrade libecapUpgrade squid-migration-scriptUpgrade squidUpgrade libecap-debuginfoUpgrade libecap-debugsourceUpgrade squid-debuginfo | Mar 5, 2024 | Feb 14, 2024 |
| Rocky_linux | — | Upgrade libecapUpgrade libecap-develUpgrade libecap-debuginfoUpgrade libecap-debugsource | May 8, 2025 | Feb 14, 2024 |
| Suse | — | Upgrade squid | Apr 5, 2024 | Feb 14, 2024 |
| Ubuntu | — | Upgrade squidUpgrade squid3 (Ubuntu Pro)Upgrade squid (Ubuntu Pro) | Apr 11, 2024 | Feb 14, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Feb 14, 2024 |
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