CVE-2026-21243
Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 10.0.17763.8389, 10.0.20348.4773, 10.0.25398.2149, 10.0.26100.32370
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Microsoft Windows Server 2019
From 10.0.17763.0 · fixed in 10.0.17763.8389
- Microsoft Windows Server 2019 (Server Core installation)
From 10.0.17763.0 · fixed in 10.0.17763.8389
- Microsoft Windows Server 2022
From 10.0.20348.0 · fixed in 10.0.20348.4773
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
From 10.0.25398.0 · fixed in 10.0.25398.2149
- Microsoft Windows Server 2025
From 10.0.26100.0 · fixed in 10.0.26100.32370
- Microsoft Windows Server 2025 (Server Core installation)
From 10.0.26100.0 · fixed in 10.0.26100.32370