CVE-2015-8960 json
The TLS protocol 1.2 and earlier supports the rsa_fixed_dh, dss_fixed_dh, rsa_fixed_ecdh, and ecdsa_fixed_ecdh values for ClientCertificate…
published 2016-09-21 10 y ago modified 2026-06-17 4 mo ago also EUVD-2015-8816
- cvss
- 8.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.9%
- EPSS 1.9% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known
Summary
The TLS protocol 1.2 and earlier supports the rsa_fixed_dh, dss_fixed_dh, rsa_fixed_ecdh, and ecdsa_fixed_ecdh values for ClientCertificateType but does not directly document the ability to compute the master secret in certain situations with a client secret key and server public key but not a server secret key, which makes it easier for man-in-the-middle attackers to spoof TLS servers by leveraging knowledge of the secret key for an arbitrary installed client X.509 certificate, aka the "Key Compromise Impersonation (KCI)" issue.
Exploit prediction
1.95% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- usenix.org https://www.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdf referenced PoC, tagged "exploit" by a source, unverified
- kcitls.org https://kcitls.org referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-295 Improper Certificate Validation
References
-
usenix.org
/system/files/conference/woot15/woot15-paper-hlauschek.pdf
exploit, mitigation, technical-description
-
kcitls.org
exploit, technical-description
-
openwall.com
/lists/oss-security/2016/09/20/4
mailing-list, technical-description, third-party-advisory
-
twitter.com
/matthew_d_green/statuses/630908726950674433
press/media-coverage, technical-description, third-party-advisory
-
securityfocus.com
/bid/93071
vdb-entry, broken-link, third-party-advisory
-
security.netapp.com
/advisory/ntap-20180626-0002/
third-party-advisory
Sources
- CVE List CVE-2015-8960
- NVD CVE-2015-8960
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.