{"id":"CVE-2016-8671","aliases":["EUVD-2016-9510","GHSA-8q3f-94v5-w475"],"status":"published","title":"The pstm_exptmod function in MatrixSSL 3.8.6 and earlier does not properly perform modular...","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.","severity":{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01336,"percentile":0.71401,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200"],"published":"2017-01-13T16:00:00Z","modified":"2026-06-17T00:54:46Z","products":[{"vendor":"matrixssl","product":"matrixssl"}],"references":[{"url":"http://www.openwall.com/lists/oss-security/2016/10/15/8","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2016/10/15/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory"]},{"url":"http://www.securityfocus.com/bid/95439","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"https://blog.fuzzing-project.org/54-Update-on-MatrixSSL-miscalculation-CVE-2016-8671%2C-incomplete-fix-for-CVE-2016-6887.html","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-8671"},{"url":"https://blog.fuzzing-project.org/54-Update-on-MatrixSSL-miscalculation-CVE-2016-8671,-incomplete-fix-for-CVE-2016-6887.html"},{"url":"https://github.com/advisories/GHSA-8q3f-94v5-w475"}],"sources":{"cve":[{"id":"CVE-2016-8671","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.","status":"published","published":"2017-01-13T16:00:00Z","modified":"2024-08-06T02:27:41.271Z","updated_at":"2026-11-02T14:33:32.724067Z"}],"euvd":[{"id":"EUVD-2016-9510","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.","status":"published","published":"2017-01-13T16:00:00Z","modified":"2024-08-06T02:27:41Z","updated_at":"2026-11-03T02:22:29.639634Z"}],"ghsa":[{"id":"GHSA-8q3f-94v5-w475","title":"The pstm_exptmod function in MatrixSSL 3.8.6 and earlier does not properly perform modular...","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.","status":"published","published":"2022-05-17T03:03:36Z","modified":"2025-04-20T03:32:15Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:01:39.626411Z"}],"nvd":[{"id":"CVE-2016-8671","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.","status":"published","published":"2017-01-13T16:59:00.62Z","modified":"2026-06-17T00:54:46.893Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:03:33.686843Z"}]}}