Is CVE-2019-16905 in the CISA KEV catalog?

No. CVE-2019-16905 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-16905?

CVE-2019-16905 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2019-16905?

CVE-2019-16905 has an EPSS score of 2.17% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-16905?

Upgrade openssh on debian 11 to 1:8.1p1-1 or later.

CVE & CISA-KEV Catalog

CVE-2019-16905

HIGHEPSS 80th pctl

7.8

CVSS v3

NVD

Description

OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH.

CWE-190Integer Overflow

How to fix

Remediation Available

opensshDebian

Fixed in:1:8.1p1-1CVE-2019-16905

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.17%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Patch1

cvsweb.openbsd.org

Exploit1

ssd-disclosure.com

Vendor Advisory1

cvsweb.openbsd.org

Third-Party Advisory5

Release Notes1

openssh.com

Related Vulnerabilities

Other CWE-190 (Integer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix
CVE-2019-11477	High	7.5	99%	-	Fix
CVE-2023-44443	High	7.8	94%	-	Fix
CVE-2014-0569	High	9.3	90%	-	-
CVE-2017-3599	High	7.5	90%	-	Fix
CVE-2023-21716	Critical	9.8	82%	-	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 2025-04-23.