Is CVE-2016-6886 in the CISA KEV catalog?

No. CVE-2016-6886 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-6886?

CVE-2016-6886 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2016-6886?

CVE-2016-6886 has an EPSS score of 1.69% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2016-6886?

No published fix for CVE-2016-6886 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2016-6886

HIGHEPSS 75th pctl

7.5

CVSS v3

NVD

Description

The pstm_reverse function in MatrixSSL before 3.8.4 allows remote attackers to cause a denial of service (invalid memory read and crash) via a (1) zero value or (2) the key's modulus for the secret key during RSA key exchange.

CWE-320

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

TridentStack Control tracks known vulnerabilities across your Windows, macOS, and Linux fleet and shows the fix as soon as one is published. See how it works

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.69%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Patch1

matrixssl.org

Third-Party Advisory1

blog.fuzzing-project.org

Other references1

securityfocus.com

Related Vulnerabilities

Other CWE-320 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-0936	Critical	9.8	78%	-	-
CVE-2018-0732	High	7.5	49%	-	Fix
CVE-2015-0839	High	8.1	6.3%	-	Fix
CVE-2018-0124	Critical	9.8	5.2%	-	Fix
CVE-2016-9963	Medium	5.9	3.1%	-	Fix
CVE-2016-2217	Medium	5.3	2.5%	-	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 2026-05-13.