How severe is CVE-2016-6891?

CVE-2016-6891 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-6891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6891?

CVE-2016-6891 affects Matrixssl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-6891?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-6891 published?

CVE-2016-6891 was published on 2017-01-05 and last updated on 2026-06-17.

CVE-2016-6891

CVE-2016-6891 is a high-severity vulnerability in Matrixssl with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Matrixssl
Published: 2017-01-05
Last modified: 2026-06-17

Description

MatrixSSL before 3.8.6 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted ASN.1 Bit Field primitive in an X.509 certificate.

Frequently asked questions

What is CVE-2016-6891?: MatrixSSL before 3.8.6 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted ASN.1 Bit Field primitive in an X.509 certificate.
How severe is CVE-2016-6891?: CVE-2016-6891 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-6891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6891?: CVE-2016-6891 affects Matrixssl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-6891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-6891 published?: CVE-2016-6891 was published on 2017-01-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:matrixssl:matrixssl:*:*:*:*:*:*:*:*

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CVE-2017-2781 — Critical (CVSS 9.8): An exploitable heap buffer overflow vulnerability exists in the X509 certificate parsing functionality of InsideSecure…
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