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CVE-2016-6887

16
FAUCET Score

CVE-2016-6887 describes a flaw in the pstm_exptmod function of MatrixSSL 3.8.6 and earlier, allowing remote attackers to potentially predict secret keys through a CRT attack due to improper modular exponentiation. This vulnerability carries a CVSSv3 score of 5.9 (MEDIUM), indicating a high confidentiality impact with high attack complexity and no user interaction required. Despite its potential impact, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.8.6CPE matchmatch criteria
cpe:2.3:a:matrixssl:matrixssl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.16%
Probability of exploitation in next 30 days
EPSS Percentile
63.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0116 is in the 27th percentile among its peer group of 19,955 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, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

blog.fuzzing-project.org / 51-Fun-with-Bignums-Crashing-MatrixSSL-and-more.html
Third Party Advisory
matrixssl.org / blog/releases/matrixssl_3_8_4
PatchVendor Advisory