Vulnerability details

CVE-2026-62820

Microsoft Windows Server

Windows DNS Server Remote Code Execution Vulnerability

CVSS 3.1

8.1High

Official description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows DNS allows an unauthorized attacker to execute code over a network.

CVSS scores

Score	Version	Source	Vector
8.1High	3.1	CVEProject cvelistV5 (CNA) (microsoft)	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`

Affected products

Vendor	Product	Versions	Source
Microsoft	Windows Server 2016	10.0.14393.0 ≤ v < 10.0.14393.9418	CVEProject cvelistV5 (CNA)
Microsoft	Windows Server 2016 (Server Core installation)	10.0.14393.0 ≤ v < 10.0.14393.9418	CVEProject cvelistV5 (CNA)
Microsoft	Windows Server 2019	10.0.17763.0 ≤ v < 10.0.17763.9121	CVEProject cvelistV5 (CNA)
Microsoft	Windows Server 2019 (Server Core installation)	10.0.17763.0 ≤ v < 10.0.17763.9121	CVEProject cvelistV5 (CNA)
Microsoft	Windows Server 2022	10.0.20348.0 ≤ v < 10.0.20348.5499	CVEProject cvelistV5 (CNA)
Microsoft	Windows Server 2025	10.0.26100.0 ≤ v < 10.0.26100.33296	CVEProject cvelistV5 (CNA)
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 ≤ v < 10.0.26100.33296	CVEProject cvelistV5 (CNA)

References and advisories

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62820 vendor-advisorypatch

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Details

Published: 2026-08-11
Last updated: 2026-10-30
State: Published
Assigner (CNA): microsoft

Exploit prediction (EPSS)

0.54%

Probability of exploitation in 30 days

45.7%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')