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CVE-2016-6892

20
FAUCET Score

CVE-2016-6892 describes a denial-of-service vulnerability in MatrixSSL versions prior to 3.8.6, specifically within the x509FreeExtensions function. A remote attacker can trigger this by providing a specially crafted X.509 certificate, leading to the freeing of unallocated memory. This vulnerability carries a CVSS v3 score of 7.5 (HIGH), indicating it is easily exploitable over the network with no user interaction, resulting in high availability impact. There is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit, Nuclei, or ExploitDB, though it has received some community discussion and media coverage.

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 2026-07-26
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