High 8.8Published Aug 11, 2026

CVE-2026-62817Windows DNS Server Remote Code Execution Vulnerability

Updated under an hour ago (Oct 26, 2026, 5:40 PM ET)

Does this affect you?

It affects Microsoft Windows Server 2019 and 9 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Microsoft Windows Server 2019

Exploited in the last 30 days

Out-of-bounds write in Windows DNS allows an unauthorized attacker to execute code over an adjacent network.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Windows Server 2019 microsoft:windows_server_2019 (from the name)	from 10.0.17763.0 before 10.0.17763.9121	CNA record
Microsoft Windows Server 2022 microsoft:windows_server_2022 (from the name)	from 10.0.20348.0 before 10.0.20348.5499	CNA record
Microsoft Windows Server 2025 microsoft:windows_server_2025 (from the name)	from 10.0.26100.0 before 10.0.26100.33296	CNA record
microsoft windows_10_1809 microsoft:windows_10_1809	before 10.0.17763.9121; before 10.0.17763.9121	NVD
microsoft windows_10_21h2 microsoft:windows_10_21h2	before 10.0.19044.7663; before 10.0.19044.7663; before 10.0.19044.7663	NVD
microsoft windows_10_22h2 microsoft:windows_10_22h2	before 10.0.19045.7663; before 10.0.19045.7663; before 10.0.19045.7663	NVD
microsoft windows_11_23h2 microsoft:windows_11_23h2	before 10.0.22631.7517; before 10.0.22631.7517	NVD
microsoft windows_11_24h2 microsoft:windows_11_24h2	before 10.0.26100.9106; before 10.0.26100.9106	NVD
microsoft windows_11_25h2 microsoft:windows_11_25h2	before 10.0.26200.9106; before 10.0.26200.9106	NVD
microsoft windows_11_26h1 microsoft:windows_11_26h1	before 10.0.28000.2704; before 10.0.28000.2704	NVD
1–10 of 13

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62817	vendor-advisory, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.