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Description

Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.

PUBLISHED Reserved 2025-12-30 | Published 2026-02-10 | Updated 2026-02-10 | Assigner microsoft




MEDIUM: 6.2CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

CISA Known Exploited Vulnerability

Date added 2026-02-10 | Due date 2026-03-03

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Problem types

CWE-476: NULL Pointer Dereference

Product status

10.0.17763.0 (custom) before 10.0.17763.8389
affected

10.0.17763.0 (custom) before 10.0.17763.8389
affected

10.0.17763.0 (custom) before 10.0.17763.8389
affected

10.0.20348.0 (custom) before 10.0.20348.4773
affected

10.0.19044.0 (custom) before 10.0.19044.6937
affected

10.0.19045.0 (custom) before 10.0.19045.6937
affected

10.0.26100.0 (custom) before 10.0.26100.32370
affected

10.0.26200.0 (custom) before 10.0.26200.7840
affected

10.0.22631.0 (custom) before 10.0.22631.6649
affected

10.0.22631.0 (custom) before 10.0.22631.6649
affected

10.0.25398.0 (custom) before 10.0.25398.2149
affected

10.0.26100.0 (custom) before 10.0.26100.7840
affected

10.0.26100.0 (custom) before 10.0.26100.32370
affected

10.0.14393.0 (custom) before 10.0.14393.8868
affected

10.0.14393.0 (custom) before 10.0.14393.8868
affected

10.0.14393.0 (custom) before 10.0.14393.8868
affected

6.2.9200.0 (custom) before 6.2.9200.25923
affected

6.2.9200.0 (custom) before 6.2.9200.25923
affected

6.3.9600.0 (custom) before 6.3.9600.23022
affected

6.3.9600.0 (custom) before 6.3.9600.23022
affected

10.0.28000.0 (custom) before 10.0.28000.1575
affected

10.0.28000.0 (custom) before 10.0.28000.1575
affected

References

www.cisa.gov/...erabilities-catalog?field_cve=CVE-2026-21525 government-resource

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525 (Windows Remote Access Connection Manager Denial of Service Vulnerability) vendor-advisory patch

cve.org (CVE-2026-21525)

nvd.nist.gov (CVE-2026-21525)

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