CVE-2023-49285: Denial of Service in HTTP Message Processing in Squid

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 88.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-04 · updated 2026-06-17
Weakness: CWE-126

Description

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Buffer Overread bug Squid is vulnerable to a Denial of Service attack against Squid HTTP Message processing. This bug is fixed by Squid version 6.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

Squid: through 6.4

References

http://www.squid-cache.org/Versions/v5/SQUID-2023_7.patch
http://www.squid-cache.org/Versions/v6/SQUID-2023_7.patch
https://github.com/squid-cache/squid/commit/77b3fb4df0f126784d5fd4967c28ed40eb8d521b
https://github.com/squid-cache/squid/commit/deee944f9a12c9fd399ce52f3e2526bb573a9470
https://github.com/squid-cache/squid/security/advisories/GHSA-8w9r-p88v-mmx9
https://lists.debian.org/debian-lts-announce/2024/01/msg00003.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/
https://security.netapp.com/advisory/ntap-20240119-0004/
http://www.squid-cache.org/Versions/v5/SQUID-2023_7.patch
http://www.squid-cache.org/Versions/v6/SQUID-2023_7.patch
https://github.com/squid-cache/squid/commit/77b3fb4df0f126784d5fd4967c28ed40eb8d521b

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