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CVE

CVE-2021-1669

Windows Remote Desktop Security Feature Bypass Vulnerability

Windows Remote Desktop Security Feature Bypass Vulnerability.

HIGH · CVSS 8.8 EPSS 0.07221
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  • EPSS percentile: top 8% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules6 YARA rules0
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Affected Products & Versions

5
microsoft remote desktopall versions
microsoft remote desktop clientall versions
microsoft windows 10all versions
microsoft windows server 2016all versions
microsoft windows server 2019all versions
◈

Sigma Hunt Rules

6
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighUser Added to Remote Desktop Users Group
producthighNgrok Usage with Remote Desktop Service
productmediumPotential Remote Desktop Tunneling
productmediumNew Remote Desktop Connection Initiated Via Mstsc.EXE
productmediumDenied Access To Remote Desktop
productmediumPotential Remote Desktop Connection to Non-Domain Host
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Scoring & Timeline

8.8
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 Jan 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
msrcCVE-2021-1669Security Feature Bypass
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1669
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