Is CVE-2019-18860 in the CISA KEV catalog?

No. CVE-2019-18860 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-18860?

CVE-2019-18860 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2019-18860?

CVE-2019-18860 has an EPSS score of 5.50% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-18860?

Upgrade squid on debian 11 to 4.9-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2019-18860

MEDIUMEPSS 92th pctl

6.1

CVSS v3

NVD

Description

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

CWE-74Injection

How to fix

Remediation Available

squidDebian

Fixed in:4.9-1CVE-2019-18860

squidUbuntu

Fixed in:3.5.12-1ubuntu7.11USN-4356-1

Fixed in:3.5.27-1ubuntu1.6USN-4356-1

Fixed in:4.10-1ubuntu1.1USN-4356-1

squid3Ubuntu

Fixed in:3.5.12-1ubuntu7.11USN-4356-1

Fixed in:3.5.27-1ubuntu1.6USN-4356-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

5.50%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch2

Third-Party Advisory4

Other references3

Related Vulnerabilities

Other CWE-74 (Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-2251	Critical	9.8	100%	KEV	Fix
CVE-2023-22527	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-2725	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2022-35914	Critical	9.8	100%	KEV	-
CVE-2019-17558	High	7.5	99%	KEV	Fix

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-05.