CVE-2015-8960

Public Exploit

Description

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.

Category

8.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.36%
Third-Party Advisory twitter.com Third-Party Advisory openwall.com Third-Party Advisory securityfocus.com Third-Party Advisory netapp.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.openwall.com/lists/oss-security/2016/09/20/4 mailing list third party advisory technical description
http://twitter.com/matthew_d_green/statuses/630908726950674433 press/media coverage third party advisory technical description
http://www.securityfocus.com/bid/93071 vdb entry third party advisory broken link
https://security.netapp.com/advisory/ntap-20180626-0002/ third party advisory
https://www.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdf exploit technical description mitigation
https://kcitls.org technical description exploit

Frequently Asked Questions

What is the severity of CVE-2015-8960?
CVE-2015-8960 has been scored as a high severity vulnerability.
How to fix CVE-2015-8960?
To fix CVE-2015-8960, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-8960 being actively exploited in the wild?
It is possible that CVE-2015-8960 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.