CVE-2016-8671
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.
Does this matter?
Lower severity and a low EPSS score (1.34%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 1.34% probability · 71th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- matrixssl/matrixssl
- Source
- cve@mitre.org
EPSS 1.3% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2016/10/15/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/10/15/8Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/95439
- https://blog.fuzzing-project.org/54-Update-on-MatrixSSL-miscalculation-CVE-2016-8671%2C-incomplete-fix-for-CVE-2016-6887.html
- http://www.openwall.com/lists/oss-security/2016/10/15/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/10/15/8Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/95439
- https://blog.fuzzing-project.org/54-Update-on-MatrixSSL-miscalculation-CVE-2016-8671%2C-incomplete-fix-for-CVE-2016-6887.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.