CVE-2015-8960

Name: CVE-2015-8960
Creator: NVD / NIST
Published: 2016-09-21T02:59:00.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 1.95%

Last modified Jun 17, 2026

CVE-2015-8960 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 1.95% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.95%

77.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Ietf	Transport Layer Security	<= 1.2
Netapp	Clustered Data Ontap Antivirus Connector	All versions
Netapp	Data Ontap Edge	All versions
Netapp	Host Agent	All versions
Netapp	Oncommand Shift	All versions
Netapp	Plug-In For Symantec Netbackup	All versions
Netapp	Smi-S Provider	All versions
Netapp	Snap Creator Framework	All versions
Netapp	Snapdrive	All versions
Netapp	Snapmanager	All versions
Netapp	Snapprotect	All versions
Netapp	Solidfire \& Hci Management Node	All versions
Netapp	System Setup	All versions

References

http://twitter.com/matthew_d_green/statuses/630908726950674433Press/Media Coverage, Technical Description, Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/09/20/4Mailing List, Technical Description, Third Party Advisory
http://www.securityfocus.com/bid/93071Broken Link, Third Party Advisory, VDB Entry
https://kcitls.orgExploit, Technical Description
https://security.netapp.com/advisory/ntap-20180626-0002/Third Party Advisory
https://www.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdfExploit, Mitigation, Technical Description
http://twitter.com/matthew_d_green/statuses/630908726950674433Press/Media Coverage, Technical Description, Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/09/20/4Mailing List, Technical Description, Third Party Advisory
http://www.securityfocus.com/bid/93071Broken Link, Third Party Advisory, VDB Entry
https://kcitls.orgExploit, Technical Description
https://security.netapp.com/advisory/ntap-20180626-0002/Third Party Advisory
https://www.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdfExploit, Mitigation, Technical Description

Timeline

Published: Sep 21, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-8960?

How severe is CVE-2015-8960?

CVE-2015-8960 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.95% probability of exploitation in the next 30 days.

How do I fix CVE-2015-8960?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-8960?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST