SARA / Free Tools / CVE / CVE-2019-18860

CVE-2019-18860 — Squid before 4

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

CVSS

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EPSS

3.44% (top 12.70%)

CWE

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Published

2020-03-20T20:32:16.000Z

Last modified

2025-11-05T17:04:14.102Z

CVSS vector

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01What is this vulnerability?

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

Vendor	Product	Versions
n	a / n/a	n/a

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

Patch to a fixed version listed in the vendor advisory (see references below).
Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
Hunt historical logs for exploitation indicators — see Detection signatures below.

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

github.com — https://github.com/squid-cache/squid/pull/504
github.com — https://github.com/squid-cache/squid/pull/505
lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
usn.ubuntu.com — https://usn.ubuntu.com/4356-1/
lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
www.debian.org — https://www.debian.org/security/2020/dsa-4732

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