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High 7.5Published Feb 10, 2026
CVE-2026-21243Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.
Updated under an hour ago ()
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It affects microsoft windows_server_2019 and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
microsoft windows_server_2019 microsoft:windows_server_2019 | before 10.0.17763.8389 | NVD |
microsoft windows_server_2022 microsoft:windows_server_2022 | before 10.0.20348.4711 | NVD |
microsoft windows_server_2022_23h2 microsoft:windows_server_2022_23h2 | before 10.0.25398.2149 | NVD |
microsoft windows_server_2025 microsoft:windows_server_2025 | before 10.0.26100.32313 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21243vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.