CVE-2018-8340

Name: CVE-2018-8340
Creator: NVD / NIST
Published: 2018-08-15T17:29:03.907+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 7.58%

Last modified Jun 17, 2026

CVE-2018-8340 is a vulnerability of currently unknown severity. A security feature bypass vulnerability exists when Active Directory Federation Services (AD FS) improperly handles multi-factor authentication requests, aka "AD FS Security Feature Bypass Vulnerability." This affects Windows Server 2016, Windows Server 2012 R2, Windows 10 Servers.. EPSS estimates a 7.58% chance of exploitation in the next 30 days.

Description

A security feature bypass vulnerability exists when Active Directory Federation Services (AD FS) improperly handles multi-factor authentication requests, aka "AD FS Security Feature Bypass Vulnerability." This affects Windows Server 2016, Windows Server 2012 R2, Windows 10 Servers.

Metrics

EPSS Probability

7.58%

93.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Microsoft	Windows Server 2012	r2
Microsoft	Windows Server 2016	All versions
Microsoft	Windows Server 2016	1709
Microsoft	Windows Server 2016	1803

References

http://www.securityfocus.com/bid/105029Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041474Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8340Patch, Vendor Advisory
http://www.securityfocus.com/bid/105029Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041474Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8340Patch, Vendor Advisory

Timeline

Published: Aug 15, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-8340?

How severe is CVE-2018-8340?

Severity scoring for CVE-2018-8340 is pending analysis. The EPSS model estimates a 7.58% probability of exploitation in the next 30 days.

How do I fix CVE-2018-8340?

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-2018-8340?

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

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Source: NVD / NIST