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Vulnerability record · CVE-2019-12525 · published 11 July 2019

CVE-2019-12525: Squid-cache squid out-of-bounds write vulnerability

Squid Cache · Squid

An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.

9.8 CVSS 3.1 Critical EPSS 24% · top 2.2% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
24%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
24References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html Mailing ListThird Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/ Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patch PatchVendor Advisory
https://github.com/squid-cache/squid/commits/v4 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVL
https://seclists.org/bugtraq/2019/Aug/42 Mailing ListThird Party Advisory
https://usn.ubuntu.com/4065-1/ Third Party Advisory
https://usn.ubuntu.com/4065-2/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4507 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html Mailing ListThird Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/ Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patch PatchVendor Advisory
https://github.com/squid-cache/squid/commits/v4 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVL
https://seclists.org/bugtraq/2019/Aug/42 Mailing ListThird Party Advisory
https://usn.ubuntu.com/4065-1/ Third Party Advisory
https://usn.ubuntu.com/4065-2/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4507 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-12525), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.