CVE-2026-21243
CVSS v3
7.5
HIGH
EPSS Score
1.4 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.
Technical details
- Published
- 2026-02-10
- Last Modified
- 2026-02-11
Frequently asked questions
What is CVE-2026-21243?
Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a network.
Is CVE-2026-21243 actively exploited?
Active exploitation of CVE-2026-21243 has not been confirmed. Its EPSS score was 1.4% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-21243?
CVE-2026-21243 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2026-21243 affecting your environment?
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