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Vulnerability record · CVE-2019-18860 · published 20 March 2020

CVE-2019-18860: Squid-cache squid injection vulnerability

Squid Cache · Squid

Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) parameter to cachemgr.cgi.

6.1 CVSS 3.1 Medium EPSS 5.5% · top 7.5% CWE-74 · Injection
6.1CVSS 3.1 base score, v2 4.3
5.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
15References
17 Jun 2026Last modified by NVD

Description

Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) parameter to cachemgr.cgi.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html Mailing ListThird Party Advisory
https://github.com/squid-cache/squid/pull/504 PatchThird Party Advisory
https://github.com/squid-cache/squid/pull/505 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/4356-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4732 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2025/11/04/7
http://www.openwall.com/lists/oss-security/2025/11/05/1
http://www.openwall.com/lists/oss-security/2025/11/05/7
https://github.com/squid-cache/squid/pull/504 PatchThird Party Advisory
https://github.com/squid-cache/squid/pull/505 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/4356-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4732 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-18860), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.