Intel

CVE-2026-62817

microsoft windows_10_1809: Schreibzugriff ausserhalb der Grenzen

highEPSS 0.5%

Affected

  • microsoft/windows_10_1809 lt *..10.0.17763.9121
  • microsoft/windows_10_1809 lt *..10.0.17763.9121
  • microsoft/windows_10_21h2 lt *..10.0.19044.7663
  • microsoft/windows_10_21h2 lt *..10.0.19044.7663
  • microsoft/windows_10_21h2 lt *..10.0.19044.7663
  • microsoft/windows_10_22h2 lt *..10.0.19045.7663
  • microsoft/windows_10_22h2 lt *..10.0.19045.7663
  • microsoft/windows_10_22h2 lt *..10.0.19045.7663
  • microsoft/windows_11_23h2 lt *..10.0.22631.7517
  • microsoft/windows_11_23h2 lt *..10.0.22631.7517
  • microsoft/windows_11_24h2 lt *..10.0.26100.9106
  • microsoft/windows_11_24h2 lt *..10.0.26100.9106
  • microsoft/windows_11_25h2 lt *..10.0.26200.9106
  • microsoft/windows_11_25h2 lt *..10.0.26200.9106
  • microsoft/windows_11_26h1 lt *..10.0.28000.2704
  • microsoft/windows_11_26h1 lt *..10.0.28000.2704
  • microsoft/windows_server_2019 lt *..10.0.17763.9121
  • microsoft/windows_server_2022 lt *..10.0.20348.5440
  • microsoft/windows_server_2025 lt *..10.0.26100.33222

Description

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

Source: NVD (NIST)cvelistv5Microsoft Security Update GuideBSI WID PortalBSI CSAF

Affected operating systems

  • windows

    microsoft / windows_10_1809

  • windows

    microsoft / windows_10_21h2

  • windows

    microsoft / windows_10_22h2

  • windows

    microsoft / windows_11_23h2

  • windows

    microsoft / windows_11_24h2

  • windows

    microsoft / windows_11_25h2

  • windows

    microsoft / windows_11_26h1

  • windows

    microsoft / windows_server_2019

  • windows

    microsoft / windows_server_2022

  • windows

    microsoft / windows_server_2025

Metrics

XIEM Effective CVSS
8.8
Source: nvd-v3
EPSS percentile
43.4 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
high
Priority score
84.07
Exploit maturity
no public PoC known
CVSS v3
8.8
EPSS score
0.5 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-08-11 17:04 UTC
CWE
CWE-787

Weakness classes (CWE)

  • CWE-787Base

    Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. CVE Modified2026-09-02 18:20 UTC· secure@microsoft.com
    • Affected: Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/62xxx/CVE-2026-62817.json">CVE-2026-62817</a>
    • Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62817
    • Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62817
    • Reference Type: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62817 Types: Patch, Vendor Advisory
  2. Initial Analysis2026-08-17 16:04 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:* versions up to (excluding) 10.0.19044.7663 *cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:* versions up to (excluding) 10.0.19044.7663 *cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:* versions up to (excluding) 10.0.19044.7663 *cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:* versions up to (excluding) 10.0.19045.7663 *cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:* versions up to (excluding) 10.0.19045.7663 *cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:* versions up to (excluding) 10.0.19045.7663 *cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:* versions up to (excluding) 10.0.22631.7517 *cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:* versions up to (excluding) 10.0.22631.7517 *cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:* versions up to (excluding) 10.0.26100.9106 *cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:* versions up to (excluding) 10.0.26100.9106 *cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:* versions up to (excluding) 10.0.28000.2704 *cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:* versions up to (excluding) 10.0.28000.2704 *cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:* versions up to (excluding) 10.0.26200.9106 *cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:* versions up to (excluding) 10.0.26200.9106 *cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.20348.5440 *cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.26100.33222 *cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* versions up to (excluding) 10.0.17763.9121 *cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* versions up to (excluding) 10.0.17763.9121 *cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.17763.9121
    • Reference Type: Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62817 Types: Patch, Vendor Advisory
  3. CVE Modified2026-08-16 19:17 UTC· secure@microsoft.com
    • Affected: Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2 (+10) → Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2 (+10)
  4. CVE Modified2026-08-11 19:18 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-62817","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalI…
  5. New CVE Received2026-08-11 17:18 UTC· secure@microsoft.com
    • Affected: Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2 (+10)
    • Description: Out-of-bounds write in Windows DNS allows an unauthorized attacker to execute code over an adjacent network.
    • CVSS V3.1: AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    • CWE: CWE-787

Linked advisories