7.5
High
CVE-2026-21243 Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny…
Description
Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows Server 2019 10.0 | 10.0.17763.0 → < 10.0.17763.8389 | 10.0.17763.8389 |
| Windows Server 2019 (Server Core installation) 10.0 | 10.0.17763.0 → < 10.0.17763.8389 | 10.0.17763.8389 |
| Windows Server 2022 10.0 | 10.0.20348.0 → < 10.0.20348.4773 | 10.0.20348.4773 |
| Windows Server 2025 (Server Core installation) 10.0 | 10.0.26100.0 → < 10.0.26100.32370 | 10.0.26100.32370 |
| Windows Server 2022, 23H2 Edition (Server Core installation) 10.0 | 10.0.25398.0 → < 10.0.25398.2149 | 10.0.25398.2149 |
| Windows Server 2025 10.0 | 10.0.26100.0 → < 10.0.26100.32370 | 10.0.26100.32370 |
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