8.1

CVE-2015-8960: ietf transport_layer_security Improper Certificate Validation

CVSS: 8.1v3.1HighModified
Published 21-09-2016Last modified 06-08-2024
Open JSON

Vulnerability summary

CVE-2015-8960 is a high (CVSS 8.1) Improper Certificate Validation vulnerability in ietf transport_layer_security. EPSS estimates a 1.95% chance of exploitation in the next 30 days, higher than 79.8% of scored vulnerabilities. 2 public exploits are recorded.

Overall risk
43/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
1.95%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits2reference

Timeline

  1. 21-09-2016
    PublishedVulnerability first disclosed.
  2. 06-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.95%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

0.00 pp

From 1.95% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.95%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (usenix.org)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (kcitls.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Netapp12 products
Ietf1 product

2 vendors · 13 products

References

6 links