Is CVE-2016-8858 in the CISA KEV catalog?

No. CVE-2016-8858 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-8858?

CVE-2016-8858 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2016-8858?

CVE-2016-8858 has an EPSS score of 29.46% (98th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-8858?

Upgrade openssh on debian 11 to 1:7.3p1-2 or later.

CVE & CISA-KEV Catalog

CVE-2016-8858

HIGHEPSS 98th pctl

7.5

CVSS v3

NVD

Description

The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."

CWE-399Resource Management Errors CWE-400Resource Exhaustion

How to fix

Remediation Available

opensshDebian

Fixed in:1:7.3p1-2CVE-2016-8858

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

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

29.46%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

References

Patch2

Vendor Advisory2

Third-Party Advisory7

Issue Tracking1

bugzilla.redhat.com

Other references1

cert-portal.siemens.com

Related Vulnerabilities

Other CWE-399 (Resource Management Errors) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-3103	High	10.0	90%	-	-
CVE-2009-0075	High	9.3	85%	-	-
CVE-2005-1790	Low	2.6	83%	-	-
CVE-2010-0806	High	8.8	82%	KEV	-
CVE-2009-2526	High	7.8	82%	-	-
CVE-2015-1868	High	7.8	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 2026-05-29.