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ExploitedIn CISA KEVFix available

CVE-2026-21533

Windows Remote Desktop Services Elevation of Privilege Vulnerability

Exploitation confirmed. First attested on 2026-02-10 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2026-02-10
  • WeaknessCWE-269

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

Timeline

dates in UTC
  1. 2026-02-10Added to the CISA KEV catalogCISA KEV
  2. 2026-02-10Listed as exploited by GCVEGCVE
  3. 2026-02-10Exploitation first reportedCISA KEV
  4. 2026-02-1018:16CVE publishedNVD
  5. 2026-02-1104:55SSVC exploitation set to activeCISA-ADP

Versions per branch

NVD
Microsoft windows server 2012
BranchAffectedFixed in
—all versionsno fix published
—= r2no fix published
Microsoft windows 10 1607
BranchAffectedFixed in
10.0< 10.0.14393.886810.0.14393.8868
Microsoft windows 10 1809
BranchAffectedFixed in
10.0< 10.0.17763.838910.0.17763.8389

10 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA22 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft Windows 10 Version 1607

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 10.0.14393.0, < 10.0.14393.8868fixed in 10.0.14393.8868custom
  • Microsoft Windows 10 Version 1809

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 10.0.17763.0, < 10.0.17763.8389fixed in 10.0.17763.8389custom
  • Microsoft Windows 10 Version 21H2

    platforms: 32-bit Systems, ARM64-based Systems, x64-based Systems

    Affected
    • ≥ 10.0.19044.0, < 10.0.19044.6937fixed in 10.0.19044.6937custom
  • Microsoft Windows 10 Version 22H2

    platforms: 32-bit Systems, ARM64-based Systems, x64-based Systems

    Affected
    • ≥ 10.0.19045.0, < 10.0.19045.6937fixed in 10.0.19045.6937custom
  • Microsoft Windows 11 version 22H3

    platforms: ARM64-based Systems

    Affected
    • ≥ 10.0.22631.0, < 10.0.22631.6649fixed in 10.0.22631.6649custom
  • Microsoft Windows 11 Version 23H2

    platforms: x64-based Systems

    Affected
    • ≥ 10.0.22631.0, < 10.0.22631.6649fixed in 10.0.22631.6649custom

16 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-08-19

Fix

  1. CISA’s required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.due 2026-03-03

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2026-02-10
Patch Due Date
2026-03-03
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-02-10
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-qppx-835v-jvwp

Frequently asked questions

What is CVE-2026-21533?

Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

Is CVE-2026-21533 actively exploited?

Yes. CVE-2026-21533 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-03-03.

What is the CVSS score for CVE-2026-21533?

CVE-2026-21533 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record