Description
Use after free in Windows Deployment Services allows an unauthorized attacker to execute code over a network.
Published: 2026-08-11
Score: 9.8 Critical
EPSS: 2.7% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A use‑after‑free flaw exists in the Windows Deployment Services TFTP server that lets an unauthorized attacker send crafted packets over the network and execute code on the target system. The vulnerability can be used to run arbitrary code with the privileges of the WDS service, potentially giving the attacker full control of the host and exposing sensitive data.

Affected Systems

Microsoft Windows 10 versions 1607 and 1809, and Windows Server releases 2012, 2012 R2, 2016, 2019, 2022 and 2025 (including server‑core installations). All listed OEM releases are affected.

Risk and Exploitability

The CVSS score of 9.8 signifies a critical severity. The EPSS score is 2%, and the vulnerability is not currently listed in CISA KEV. The likely attack vector is through the TFTP port (69) used by the WDS service; an adversary who can reach this port and send a malicious payload can trigger the use‑after‑free and gain code execution on the server.

Generated by OpenCVE AI on August 13, 2026 at 01:18 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest Microsoft security update that addresses CVE-2026-62893 via Windows Update or the Microsoft Security Update Rollup.
  • If the update is not currently available for the affected system, disable or uninstall Windows Deployment Services to eliminate the attack surface.
  • In addition, block inbound traffic to TCP/UDP port 69 from untrusted networks using firewalls or network segmentation to prevent attackers from reaching the vulnerable TFTP service.

Generated by OpenCVE AI on August 13, 2026 at 01:18 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Mon, 17 Aug 2026 11:30:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)

Fri, 14 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

Tue, 11 Aug 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 11 Aug 2026 17:15:00 +0000

Type Values Removed Values Added
Description Use after free in Windows Deployment Services allows an unauthorized attacker to execute code over a network.
Title Windows Deployment Services TFTP Server Remote Code Execution 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-416
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': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/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 (server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 Windows Server 2012 R2 (server Core Installation) Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-08-31T20:05:23.231Z

Reserved: 2026-07-14T21:13:55.101Z

Link: CVE-2026-62893

cve-icon Vulnrichment

Updated: 2026-08-11T20:41:56.469Z

cve-icon NVD

Status : Analyzed

Published: 2026-08-11T17:18:43.440

Modified: 2026-08-16T19:17:11.433

Link: CVE-2026-62893

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-17T11:15:03Z

Weaknesses