CVE-2018-8340

Windows Server 2012 vulnerability

CVSS

6.5

EPSS

7.6%

EPSS pct

94th

Exploited

No known

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.

Affected vendor

Microsoft

Affected product

Windows Server 2012

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Published

2018-08-15

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality.

Its EPSS score of 7.6% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2018-8340

Confirm whether Microsoft Windows Server 2012 is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2018-8340.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-8340

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2018-8340 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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