ZDI-26-544: Microsoft Windows Deployment Services Use-After-Free Remote Code Execution Vulnerability
ZDI discloses an unauthenticated use-after-free remote code execution flaw in Windows Deployment Services (CVE-2026-62893, CVSS 7.5).
ZDI advisory ZDI-26-544 describes a use-after-free in Microsoft Windows Server Deployment Services that allows network-adjacent attackers to execute arbitrary code without authentication. Only systems with Windows Deployment Services enabled are vulnerable. The flaw carries a CVSS rating of 7.5 and is tracked as CVE-2026-62893.
- Use-after-free in Windows Deployment Services allows unauthenticated RCE
- Attack vector is network-adjacent; no authentication required
- Only servers with WDS role enabled are affected
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-62893 | Pre-auth use-after-free RCE in Microsoft Windows Deployment Services (WDS) | 9.8 | 3% |
From the original article
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Microsoft Windows Server. Authentication is not required to exploit this vulnerability. However, only systems with Windows Deployment Services enabled are vulnerable.
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