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Fencer Intel
medium 5.3

CVE-2020-0837 json

ADFS MFA Elevation of Privilege Vulnerability

published 6y ago modified 4mo ago also EUVD-2020-2309

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

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

Patch / fix

Is CVE-2020-0837 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

1.44% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 5.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
CNA 3.1 5.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:P/A:N

Affected products

  • Microsoft Windows 10 Version 1809
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows 10 Version 1909
  • Microsoft Windows Server, version 1909 (Server Core installation)
  • Microsoft Windows 10 Version 1903 for 32-bit Systems
  • Microsoft Windows 10 Version 1903 for x64-based Systems
  • Microsoft Windows 10 Version 1903 for ARM64-based Systems
  • Microsoft Windows Server, version 1903 (Server Core installation)
  • Microsoft Windows 10 Version 2004
  • Microsoft Windows Server version 2004
  • Microsoft Windows 10 Version 1607
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.