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CVE-2016-8671

17
FAUCET Score

CVE-2016-8671 describes a flaw in the pstm_exptmod function of MatrixSSL versions 3.8.6 and earlier, where improper modular exponentiation could allow a remote attacker to predict the secret key. This vulnerability carries a CVSSv3 score of 5.9 (Medium), indicating a network-based attack with high complexity, but potentially leading to high confidentiality impact. Despite its potential, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

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
1.35%
Probability of exploitation in next 30 days
EPSS Percentile
68.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0135 is in the 39th percentile among its peer group of 19,956 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 / 54-Update-on-MatrixSSL-miscalculation-CVE-2016-8671%2C-incomplete-fix-for-CVE-2016-6887.html
openwall.com / lists/oss-security/2016/10/15/2
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/10/15/8
Mailing ListThird Party Advisory
securityfocus.com / bid/95439