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CVE-2016-6891

20
FAUCET Score

CVE-2016-6891 describes an out-of-bounds read vulnerability in MatrixSSL versions prior to 3.8.6, specifically affecting the handling of crafted ASN.1 Bit Field primitives within X.509 certificates. This vulnerability carries a high CVSS v3 score of 7.5, indicating it can be exploited remotely with low attack complexity, requiring no user interaction, and leading to a denial of service. While no public exploit code or active exploitation is reported, the vulnerability has garnered some community discussion and media coverage, highlighting its potential impact on IoT devices.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.8.5CPE matchmatch criteria
cpe:2.3:a:matrixssl:matrixssl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.88%
Probability of exploitation in next 30 days
EPSS Percentile
77.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0188 is in the 60th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / matrixssl/matrixssl/blob/3-8-6-open/CHANGES.md
PatchRelease NotesThird Party Advisory
kb.cert.org / vuls/id/396440
Third Party AdvisoryUS Government Resource
securityfocus.com / bid/93498
Third Party AdvisoryVDB Entry
tripwire.com / state-of-security/security-data-protection/cyber-security/flawed-matrixssl-code-highlights-need-for-better-iot-update-practices
Technical DescriptionThird Party Advisory