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Vulnerability record · CVE-2019-18677 · published 26 November 2019

CVE-2019-18677: Squid-cache squid cross-site request forgery vulnerability

Squid Cache · Squid

An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.

6.1 CVSS 3.1 Medium EPSS 7.2% · top 5.9% CWE-352 · Cross-site request forgery
6.1CVSS 3.1 base score, v2 5.8
7.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.

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

Affected products

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

References

LinkTags
http://www.squid-cache.org/Advisories/SQUID-2019_9.txt Third Party Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-e5f1813a674848dde570f7920873e1071f96e0b4.patch Release Notes
http://www.squid-cache.org/Versions/v4/changesets/squid-4-36492033ea4097821a4f7ff3ddcb971fbd1e8ba0.patch Release Notes
https://bugzilla.suse.com/show_bug.cgi?id=1156328 Issue TrackingThird Party Advisory
https://github.com/squid-cache/squid/pull/427 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/12/msg00011.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW5
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D
https://usn.ubuntu.com/4213-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4682
http://www.squid-cache.org/Advisories/SQUID-2019_9.txt Third Party Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-e5f1813a674848dde570f7920873e1071f96e0b4.patch Release Notes
http://www.squid-cache.org/Versions/v4/changesets/squid-4-36492033ea4097821a4f7ff3ddcb971fbd1e8ba0.patch Release Notes
https://bugzilla.suse.com/show_bug.cgi?id=1156328 Issue TrackingThird Party Advisory
https://github.com/squid-cache/squid/pull/427 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/12/msg00011.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW5
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D
https://usn.ubuntu.com/4213-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4682

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Source: NIST National Vulnerability Database (record CVE-2019-18677), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.