Auth bypass in Cisco Identity Services Engine

CVE-2017-6747

A vulnerability in the authentication module of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to bypass local authentication. The vulnerability is due to improper handling of authentication requests and policy assignment for externally authenticated users. An attacker could exploit this vulnerability by authenticating with a valid external user account that matches an internal username and incorrectly receiving the authorization policy of the internal account. An exploit could allow the attacker to have Super Admin privileges for the ISE Admin portal. This vulnerability does not affect endpoints authenticating to the ISE. The vulnerability affects Cisco ISE, Cisco ISE Express, and Cisco ISE Virtual Appliance running Release 1.3, 1.4, 2.0.0, 2.0.1, or 2.1.0. Release 2.2.x is not affected. Cisco Bug IDs: CSCvb10995.

Vulnerability class: Broken Authentication

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.055 (92.7th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2017-6747: held from 0.055 to 0.055.

EPSS over last 30 days · oldest: 0.055 · newest: 0.055 · change: 0.000

Affected products

  • Cisco Identity Services Engine — versions 1.4(0.908), 2.0(0.147), 2.0(0.169)
  • Cisco Identity Services Engine — versions Cisco Identity Services Engine

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2017-6747?
CVE-2017-6747 is a critical-severity vulnerability in Cisco Identity Services Engine, classified under Improper Authentication. CVSS score: 9.8/10. Published 2017-08-07.
How severe is CVE-2017-6747?
Critical severity. CVSS v3 base score is 9.8 out of 10.