Intel

CVE-2026-62820

microsoft windows_10_1607: Race-Condition

highEPSS 0.5%

Affected

  • microsoft/windows_10_1607 lt *..10.0.14393.9418
  • microsoft/windows_10_1607 lt *..10.0.14393.9418
  • microsoft/windows_10_1809 lt *..10.0.17763.9121
  • microsoft/windows_10_1809 lt *..10.0.17763.9121
  • microsoft/windows_server_2016 lt *..10.0.14393.9418
  • 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

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

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

Affected operating systems

  • windows

    microsoft / windows_10_1607

  • windows

    microsoft / windows_10_1809

  • windows

    microsoft / windows_server_2016

  • windows

    microsoft / windows_server_2019

  • windows

    microsoft / windows_server_2022

  • windows

    microsoft / windows_server_2025

Metrics

XIEM Effective CVSS
8.1
Source: nvd-v3
EPSS percentile
43.9 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
high
Priority score
80.89
Exploit maturity
no public PoC known
CVSS v3
8.1
EPSS score
0.5 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-08-11 17:04 UTC
CWE
CWE-362

Weakness classes (CWE)

  • CWE-362Class

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

    The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

    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-2026-62820.json">CVE-2026-62820</a>
    • Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62820
    • Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62820
    • Reference Type: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62820 Types: Patch, Vendor Advisory
  2. Initial Analysis2026-08-17 15:54 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* versions up to (excluding) 10.0.14393.9418 *cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* versions up to (excluding) 10.0.14393.9418 *cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.14393.9418 *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-2026-62820 Types: Patch, Vendor Advisory
  3. CVE Modified2026-08-16 19:17 UTC· secure@microsoft.com
    • Affected: Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2016 (+6) → Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2016 (+6)
  4. CVE Modified2026-08-11 20:18 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-62820","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 1607, Windows 10 Version 1809, Windows Server 2016 (+6)
    • 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 V3.1: AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    • CWE: CWE-362

Linked advisories