CVE-2024-25617: Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be...

Description

Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version 6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5. There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

88.86%

99.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Squid-Cache	Squid	>= 3.0, < 6.5
Netapp	Bluexp	All versions

References

https://github.com/squid-cache/squid/commit/72a3bbd5e431597c3fdb56d752bc56b010ba3817Patch, Vendor Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-h5x6-w8mv-xfprMitigation, Third Party Advisory, Vendor Advisory
https://security.netapp.com/advisory/ntap-20240322-0006/Patch, Third Party Advisory, Vendor Advisory
https://github.com/squid-cache/squid/commit/72a3bbd5e431597c3fdb56d752bc56b010ba3817Patch, Vendor Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-h5x6-w8mv-xfprMitigation, Third Party Advisory, Vendor Advisory
https://security.netapp.com/advisory/ntap-20240322-0006/Patch, Third Party Advisory, Vendor Advisory

Timeline

Published: Feb 14, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-25617?

Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version 6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5. There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2

How severe is CVE-2024-25617?

CVE-2024-25617 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 88.86% probability of exploitation in the next 30 days.

How do I fix CVE-2024-25617?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.