THREATPORT/VULNERABILITY/CVE-2020-17049
MEDIUM SEVERITY

CVE-2020-17049

Windows Server 2012 vulnerability

CVSS
6.6
EPSS
13.8%
EPSS pct
96th
Exploited
No known
A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD). To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it. The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.
Affected vendor
Microsoft
Affected product
Windows Server 2012
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-863 — Incorrect Authorization
Published
2020-11-11

Risk analysis

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

Its EPSS score of 13.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2020-17049

  • 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-2020-17049.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-17049

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