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CVE-2023-49285

Denial of Service in HTTP Message Processing in Squid

HIGH
7.5
CVSS Score
Published: December 4, 2023 at 10:56 PM UTC
Updated: June 17, 2026 at 06:35 AM UTC
2 products affected across 1 vendorSquidCache Squid

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Severity
HIGH7.5
Exploit prediction
EPSS 88%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Squid· Squid Cache
95%
v ≤ 6.4
Affected range stops below 6.5, so it looks safe — our inference, not a vendor statement
Cache Squid· Squid Cache
75%
v ≤ 6.4
Affected range stops below 6.5, so it looks safe — our inference, not a vendor statement

References (9)

x_refsource_MISCBroken Link
Source: [email protected]
http://www.squid-cache.org/Versions/v5/SQUID-2023_7.patch
x_refsource_MISCBroken Link
Source: [email protected]
http://www.squid-cache.org/Versions/v6/SQUID-2023_7.patch
x_refsource_MISCPatch
Source: [email protected]
https://github.com/squid-cache/squid/commit/77b3fb4df0f126784d5fd4967c28ed40eb8d521b
x_refsource_MISCPatch
Source: [email protected]
https://github.com/squid-cache/squid/commit/deee944f9a12c9fd399ce52f3e2526bb573a9470
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/squid-cache/squid/security/advisories/GHSA-8w9r-p88v-mmx9
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2024/01/msg00003.html
Source: [email protected]
https://lists.fedoraproject.org/archives/list/[email protected]/message/A5QASTMCUSUEW3UOMKHZJB3FTONWSRXS/
Source: [email protected]
https://lists.fedoraproject.org/archives/list/[email protected]/message/MEV66D3PAAY6K7TWDT3WZBLCPLASFJDC/

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-126CWE-125

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