CVE-2023-5824

Squid: dos against http and https

State: Published
Severity: 7.5 High
Published: Nov 3, 2023
Updated: Nov 6, 2025
Reserved: Oct 27, 2023

Description

A flaw was found in Squid. The limits applied for validation of HTTP response headers are applied before caching. However, Squid may grow a cached HTTP response header beyond the configured maximum size, causing a stall or crash of the worker process when a large header is retrieved from the disk cache, resulting in a denial of service.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat

Weaknesses

CWE-755 Improper Handling of Exceptional Conditions

Affected Products

Product	Versions
Red Hat Enterprise Linux 8Red Hat	8090020231130092412.a75119d5 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	8020020240122164331.4cda2c84 and laterNot affected
Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceRed Hat	8020020240122164331.4cda2c84 and laterNot affected
Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsRed Hat	8020020240122164331.4cda2c84 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	8040020240122165847.522a0ee4 and laterNot affected
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRed Hat	8040020240122165847.522a0ee4 and laterNot affected
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRed Hat	8040020240122165847.522a0ee4 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update SupportRed Hat	8060020231222131040.ad008a3a and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat	8080020231222130009.63b34585 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	7:5.5-6.el9_3.2 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	7:5.2-1.el9_0.4 and laterNot affected
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat	7:5.5-5.el9_2.3 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat

References

RHSA-2023:7465vendor-advisory
RHSA-2023:7668vendor-advisory
RHSA-2024:0072vendor-advisory
RHSA-2024:0397vendor-advisory
RHSA-2024:0771vendor-advisory
RHSA-2024:0772vendor-advisory
RHSA-2024:0773vendor-advisory
RHSA-2024:1153vendor-advisory
https://access.redhat.com/security/cve/CVE-2023-5824vdb-entry
RHBZ#2245914issue-tracking
https://github.com/squid-cache/squid/security/advisories/GHSA-543m-w2m2-g255
https://security.netapp.com/advisory/ntap-20231130-0003/
https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.