CVE-2026-21525
Windows Remote Access Connection Manager Denial of Service Vulnerability
At a glance
- Source
- NVD
- EPSS
- EPSS 4.87 % · percentile 92 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Analyzed
Description
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
Weaknesses (CWE)
- CWE-476 — NULL Pointer Dereference
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21525
- https://www.vicarius.io/vsociety/posts/cve-2026-21525-detection-script-dos-vulnerability-in-windows-remote-access-connection-manager
- https://www.vicarius.io/vsociety/posts/cve-2026-21525-mitigation-script-dos-vulnerability-in-windows-remote-access-connection-manager
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 6.2 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C | microsoft |
| CVSS 3.1 | MEDIUM 6.2 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · secure@microsoft.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-7329
- GCVE · GCVE-0-2026-21525
CERT-FR advisories
- CERTFR-2026-AVI-0150 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*< 10.0.14393.8868cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*< 10.0.14393.8868cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*< 10.0.17763.8389cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*< 10.0.17763.8389cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*< 10.0.19044.6937cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*< 10.0.19044.6937cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*< 10.0.19044.6937cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*< 10.0.19045.6937cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*< 10.0.19045.6937cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*< 10.0.19045.6937cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*< 10.0.22631.6649cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*< 10.0.22631.6649cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*< 10.0.26100.7781cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*< 10.0.26100.7781cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*< 10.0.26200.7781cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*< 10.0.26200.7781cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*< 10.0.14393.8868cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*< 10.0.17763.8389cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*< 10.0.20348.4711cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*< 10.0.25398.2149cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*< 10.0.26100.32313
Affected products
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| CISA Known Exploited Vulnerabilities | CC0 1.0 |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |