CVE-2024-45802: Squid Denial of Service

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 47.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-28 · updated 2026-06-17
Weakness: CWE-20

Description

Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to Input Validation, Premature Release of Resource During Expected Lifetime, and Missing Release of Resource after Effective Lifetime bugs, Squid is vulnerable to Denial of Service attacks by a trusted server against all clients using the proxy. This bug is fixed in the default build configuration of Squid version 6.10.

Affected products

Squid: from 3.0 before 6.10 — fixed in 6.10

How to fix

Upgrade to a fixed version: Squid 6.10. Check the vendor advisory for mitigations.

References

https://github.com/squid-cache/squid/security/advisories/GHSA-f975-v7qw-q7hj
https://lists.debian.org/debian-lts-announce/2025/03/msg00009.html
https://security.netapp.com/advisory/ntap-20250103-0004/

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