CVE-2023-21557
HIGHCVSS 7.5/10EPSS 2.03%
Last modified
CVE-2023-21557 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability. EPSS estimates a 2.03% chance of exploitation in the next 30 days.
Description
Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Windows 10 1607 | All versions | — |
| Microsoft | Windows 10 1809 | All versions | — |
| Microsoft | Windows 10 20h2 | All versions | — |
| Microsoft | Windows 10 21h2 | All versions | — |
| Microsoft | Windows 10 22h2 | All versions | — |
| Microsoft | Windows 11 21h2 | All versions | — |
| Microsoft | Windows 11 22h2 | All versions | — |
| Microsoft | Windows 7 | All versions | Sp1 |
| Microsoft | Windows 8.1 | All versions | — |
| Microsoft | Windows Rt 8.1 | All versions | — |
| Microsoft | Windows Server 2008 | All versions | Sp2 |
| Microsoft | Windows Server 2008 | r2 | Sp1 |
| Microsoft | Windows Server 2012 | All versions | — |
| Microsoft | Windows Server 2012 | r2 | — |
| Microsoft | Windows Server 2016 | All versions | — |
| Microsoft | Windows Server 2019 | All versions | — |
| Microsoft | Windows Server 2022 | All versions | — |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2023-21557?
Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability
How severe is CVE-2023-21557?
CVE-2023-21557 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.03% probability of exploitation in the next 30 days.
How do I fix CVE-2023-21557?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2023-21557?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST