CVE-2016-8671

The pstm_exptmod function in MatrixSSL 3.8.6 and earlier does not properly perform modular...

5.9 Medium

The pstm_exptmod function in MatrixSSL 3.8.6 and earlier does not properly perform modular exponentiation, which might allow remote attackers to predict the secret key via unspecified vectors. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-6887.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

1.34%Up 0.1 points since Feb 4, 2022

What each source reports

NVD Score used 5.9

Record: CVE-2016-8671
CVSS 3.0: 5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:P/I:N/A:N
Weakness: CWE-200
Updated: 2026-11-02

CVE List No score

Record: CVE-2016-8671
Updated: 2026-11-02

EUVDEUVD-2016-9510 No score

Record: EUVD-2016-9510
Updated: 2026-11-03

GitHub AdvisoriesGHSA-8q3f-94v5-w475 5.9

The pstm_exptmod function in MatrixSSL 3.8.6 and earlier does not properly perform modular...

Record: GHSA-8q3f-94v5-w475
CVSS 3.0: 5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-200
Updated: 2026-11-02

Affected products

matrixssl

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-8671 is a medium vulnerability (CVSS 5.9) in Matrixssl, published January 13, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.34%, the 71st percentile. No source names a fixed version.