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High severity · published Aug 11, 2026
CVE-2026-62817
Windows DNS Server Remote Code Execution Vulnerability
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
Out-of-bounds write in Windows DNS allows an unauthorized attacker to execute code over an adjacent network.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WS
Windows Server 2019 · Microsoft
10.0.17763.0 before 10.0.17763.9121 · source: vendor, NVD
WS
Windows Server 2019 (Server Core installation) · Microsoft
10.0.17763.0 before 10.0.17763.9121 · source: vendor
WS
Windows Server 2022 · Microsoft
10.0.20348.0 before 10.0.20348.5499 · source: vendor, NVD
WS
Windows Server 2025 · Microsoft
10.0.26100.0 before 10.0.26100.33296 · source: vendor, NVD
WS
Windows Server 2025 (Server Core installation) · Microsoft
10.0.26100.0 before 10.0.26100.33296 · source: vendor
W1
Windows 10 1809 · Microsoft
before 10.0.17763.9121; before 10.0.17763.9121 · source: NVD
W1
Windows 10 21h2 · Microsoft
before 10.0.19044.7663; before 10.0.19044.7663; before 10.0.19044.7663 · source: NVD
W1
Windows 10 22h2 · Microsoft
before 10.0.19045.7663; before 10.0.19045.7663; before 10.0.19045.7663 · source: NVD
W1
Windows 11 23h2 · Microsoft
before 10.0.22631.7517; before 10.0.22631.7517 · source: NVD
W1
Windows 11 24h2 · Microsoft
before 10.0.26100.9106; before 10.0.26100.9106 · source: NVD
W1
Windows 11 25h2 · Microsoft
before 10.0.26200.9106; before 10.0.26200.9106 · source: NVD
W1
Windows 11 26h1 · Microsoft
before 10.0.28000.2704; before 10.0.28000.2704 · source: NVD
Affected product
WS
Windows Server 2019
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62817
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-62817
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62817
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