CVE-2024-25111: SQUID-2024:1 Denial of Service in HTTP Chunked Decoding

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 65.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-06 · updated 2026-06-17
Weakness: CWE-674

Description

Squid is a web proxy cache. Starting in version 3.5.27 and prior to version 6.8, Squid may be vulnerable to a Denial of Service attack against HTTP Chunked decoder due to an uncontrolled recursion bug. This problem allows a remote attacker to cause Denial of Service when sending a crafted, chunked, encoded HTTP Message. This bug is fixed in Squid version 6.8. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. There is no workaround for this issue.

Affected products

Fedoraproject Fedora: 38, 39
NetApp Bluexp: all versions
Squid: from 3.5.27 before 6.8 — fixed in 6.8

How to fix

Upgrade to a fixed version: Squid 6.8. Check the vendor advisory for mitigations.

References

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