CVE-2018-8340

ADFS Security Feature Bypass Vulnerability

CVE-2018-8340 is fixed in 6 products on 1 platform, first by KB4343887, released August 14, 2018. It is not reported as exploited. Patch Radar priority: Routine.

Routine
CVSS
6.5
Important
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0789
94th percentile

<p>A security feature bypass vulnerability exists when Active Directory Federation Services (ADFS) improperly handles multi-factor authentication requests.</p> <p>To exploit this vulnerability, an attacker could send a specially crafted authentication request. An attacker who successfully exploited this vulnerability could bypass some, but not all, of the authentication factors.</p> <p>This security update corrects how ADFS handles multi-factor authentication requests.</p>

Where it's fixed

ProductFixed inFixReleased
Microsoft
Windows Server 2012 R2 KB4343888 Aug 14, 2018
Windows Server 2012 R2 KB4343898 Aug 14, 2018
Windows Server 2012 R2 (Server Core installation) KB4343888 Aug 14, 2018
Windows Server 2012 R2 (Server Core installation) KB4343898 Aug 14, 2018
Windows Server 2016 14393.2430 KB4343887 Aug 14, 2018
Windows Server 2016 (Server Core installation) 14393.2430 KB4343887 Aug 14, 2018
Windows Server, version 1709 (Server Core Installation) 16299.611 KB4343897 Aug 14, 2018
Windows Server, version 1803 (Server Core Installation) 17134.228 KB4343909 Aug 14, 2018