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Vulnerability record · CVE-2018-1000024 · published 9 February 2018

CVE-2018-1000024: Squid-cache squid vulnerability

Squid Cache · Squid

The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerability in ESI Response Processing that can result in Denial of Service for all clients using the proxy.. This attack appear to be exploitable via Remote server delivers an HTTP response payload containing valid but unusual ESI syntax.. This vulnerability appears to have been fixed in 4.0.23 and later.

7.5 CVSS 3.0 High EPSS 7.9% · top 5.5%
7.5CVSS 3.0 base score, v2 5.0
7.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a Incorrect Pointer Handling vulnerability in ESI Response Processing that can result in Denial of Service for all clients using the proxy.. This attack appear to be exploitable via Remote server delivers an HTTP response payload containing valid but unusual ESI syntax.. This vulnerability appears to have been fixed in 4.0.23 and later.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.squid-cache.org/Advisories/SQUID-2018_1.txt PatchVendor Advisory
http://www.squid-cache.org/Versions/ Release NotesVendor Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00001.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/3557-1/ Third Party Advisory
https://usn.ubuntu.com/4059-2/
https://www.debian.org/security/2018/dsa-4122 Third Party Advisory
http://www.squid-cache.org/Advisories/SQUID-2018_1.txt PatchVendor Advisory
http://www.squid-cache.org/Versions/ Release NotesVendor Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00001.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/3557-1/ Third Party Advisory
https://usn.ubuntu.com/4059-2/
https://www.debian.org/security/2018/dsa-4122 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-1000024), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.