Description
Heap-based buffer overflow in Windows Online Certificate Status Protocol (OCSP) allows an authorized attacker to elevate privileges locally.
Published: 2026-09-08
Score: 7 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

Based on the description, it is inferred that the CVE originates from a heap‑based buffer overflow within the Windows Online Certificate Status Protocol (OCSP) subsystem. The overflow can be triggered by a maliciously crafted OCSP response, enabling a locally‑authorized attacker to execute arbitrary code and elevate privileges on the affected Windows host. The weakness falls under CWE‑122, indicating memory corruption that permits overwriting of critical heap data.

Affected Systems

Affected products include Microsoft Windows 10 Version 1607 and Version 1809, as well as multiple server editions: Windows Server 2012 and the Server Core installation, Windows Server 2012 R2 with Server Core, Windows Server 2016 (including Server Core), Windows Server 2019 (including Server Core), Windows Server 2022, and Windows Server 2025 with Server Core. All listed versions are vulnerable until the patch is applied.

Risk and Exploitability

The vulnerability has a CVSS score of 7, signifying high severity for local privilege escalation. No EPSS data is currently available, and the issue is not yet listed in CISA’s Known Exploited Vulnerabilities catalog, suggesting that widespread exploitation may not yet be documented. An attacker must first have some form of authorized local access to the machine; from that position, the buffer overflow grants the attacker the ability to gain higher privileges, potentially entire administrative control over the system. Given the lack of remote exploitation vectors, the risk remains confined to environments where malicious parties can operate locally or leverage compromised user accounts.

Generated by OpenCVE AI on September 8, 2026 at 23:06 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the Microsoft security update for CVE-2026-69564 via Windows Update or the Microsoft Security Update Guide.
  • Reboot the system to ensure the update is fully integrated.
  • After updating, enforce the principle of least privilege by removing or restricting local administrative accounts and configuring the local security policy to limit which users can run OCSP‑related services.

Generated by OpenCVE AI on September 8, 2026 at 23:06 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Tue, 08 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Description Heap-based buffer overflow in Windows Online Certificate Status Protocol (OCSP) allows an authorized attacker to elevate privileges locally.
Title Windows Online Certificate Status Protocol (OCSP) Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-122
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows Server 2012 Windows Server 2012 R2 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-09-08T23:40:31.618Z

Reserved: 2026-08-03T21:15:56.835Z

Link: CVE-2026-69564

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-08T18:19:25.360

Modified: 2026-09-08T18:39:34.660

Link: CVE-2026-69564

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-08T23:15:14Z

Weaknesses
  • CWE-122

    Heap-based Buffer Overflow