CVE-2023-50868HighCVSS 7.5

MITRE: CVE-2023-50868 NSEC3 closest encloser proof can exhaust CPU

Published
July 20, 2026
Last Modified
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🔗 CVE IDs covered (1)

CVE-2023-50868 →

📋 Description

Why is the MITRE Corporation the assigning CNA (CVE Numbering Authority)? CVE-2023-50868 is regarding a vulnerability in DNSSEC validation where an attacker could exploit standard DNSSEC protocols intended for DNS integrity by using excessive resources on a resolver, causing a denial of service for legitimate users. MITRE created this CVE on their behalf. Please see CVE-2023-50868 for more information.

🎯 Affected products11

  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 R2 (Server Core installation)
  • Windows Server 2016
  • Windows Server 2016 (Server Core installation)
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022, 23H2 Edition (Server Core installation)

✅ Remediation

KB5039217 (Security Update) — fixed build 10.0.17763.5936 KB5039227 (Security Update) — fixed build 10.0.20348.2527 KB5039330 (Security Hotpatch Update) — fixed build 10.0.20348.2522 KB5039236 (Security Update) — fixed build 10.0.25398.950 KB5039214 (Security Update) — fixed build 10.0.14393.7070 KB5039260 (Monthly Rollup) — fixed build 6.2.9200.24919 KB5039294 (Monthly Rollup) — fixed build 6.3.9600.22023

🔗 References (15)