Is CVE-2019-17420 in the CISA KEV catalog?

No. CVE-2019-17420 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-17420?

CVE-2019-17420 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2019-17420?

CVE-2019-17420 has an EPSS score of 1.35% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-17420?

Upgrade libhtp on debian 11 to 1:0.5.31-1 or later.

CVE & CISA-KEV Catalog

CVE-2019-17420

MEDIUM

5.3

CVSS v3

NVD

Description

In OISF LibHTP before 0.5.31, as used in Suricata 4.1.4 and other products, an HTTP protocol parsing error causes the http_header signature to not alert on a response with a single \r\n ending.

CWE-459

How to fix

Remediation Available

libhtpDebian

Fixed in:1:0.5.31-1CVE-2019-17420

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.35%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Patch2

Vendor Advisory1

redmine.openinfosecfoundation.org

Related Vulnerabilities

Other CWE-459 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-17090	High	7.5	82%	-	Fix
CVE-2021-39327	Medium	5.3	72%	-	-
CVE-2025-31650	High	7.5	68%	-	Fix
CVE-2022-1552	High	8.8	12%	-	Fix
CVE-2018-18924	High	8.8	9.5%	-	-
CVE-2022-21125	Medium	5.5	6.5%	-	Fix

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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 2024-11-21.