CVE-2019-18860

Name: CVE-2019-18860
Creator: NVD / NIST
Published: 2020-03-20T21:15:16.547+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 5.50%

Last modified Jun 17, 2026

CVE-2019-18860 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) parameter to cachemgr.cgi.. EPSS estimates a 5.50% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

5.50%

91.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Squid-Cache	Squid	< 4.9
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.10
Canonical	Ubuntu Linux	20.04
Opensuse	Leap	15.1

References

http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.htmlMailing List, Third Party Advisory
https://github.com/squid-cache/squid/pull/504Patch, Third Party Advisory
https://github.com/squid-cache/squid/pull/505Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
https://usn.ubuntu.com/4356-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4732Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.htmlMailing List, Third 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/504Patch, Third Party Advisory
https://github.com/squid-cache/squid/pull/505Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
https://usn.ubuntu.com/4356-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4732Third Party Advisory

Timeline

Published: Mar 20, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18860?

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

How severe is CVE-2019-18860?

CVE-2019-18860 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 5.50% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18860?

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.

Are you affected by CVE-2019-18860?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST