CVE-2026-62893 in Windows
Summary
by MITRE • 08/11/2026
Use after free in Windows Deployment Services allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 08/11/2026
Windows Deployment Services presents a critical use-after-free vulnerability that enables remote code execution by unauthorized attackers through network-based exploitation. This flaw occurs when the system fails to properly validate memory references after objects have been freed, creating opportunities for malicious actors to manipulate memory pointers and execute arbitrary code on affected systems. The vulnerability stems from improper handling of memory allocation and deallocation processes within the deployment services component, particularly during network communication scenarios where multiple concurrent operations may occur simultaneously. When a legitimate user or service requests deployment operations through the Windows Deployment Services protocol, the system allocates memory structures to handle these requests, but fails to properly verify that these structures remain valid after being freed during normal operation cycles.
The technical exploitation of this vulnerability involves crafting specific network packets that trigger the use-after-free condition in the Windows Deployment Services implementation. Attackers can manipulate deployment service requests to cause memory deallocation while still maintaining references to those freed memory locations, allowing them to overwrite critical data structures or function pointers with malicious payloads. This type of vulnerability maps directly to common software security weaknesses identified by CWE-416, which specifically addresses use-after-free conditions in memory management. The attack surface extends across all Windows operating systems that support Windows Deployment Services, including various versions of windows server and desktop editions, making the impact particularly widespread. Network-based exploitation is possible because the vulnerability exists within network-facing services that accept external connections without proper input validation or memory state checking.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise and potential lateral movement within network environments. Once an attacker successfully exploits this use-after-free condition, they can gain elevated privileges on the target system, potentially escalating from limited user access to SYSTEM level control. This capability enables attackers to install persistent backdoors, exfiltrate sensitive data, or establish command and control channels for further infiltration. The vulnerability's network accessibility means that attackers do not require physical access to systems or prior authentication credentials to exploit this flaw. From an adversary tactics perspective, this vulnerability aligns with ATT&CK technique T1059.001 for command and control communication and T1068 for local privilege escalation, making it particularly dangerous in enterprise environments where Windows Deployment Services is commonly deployed for system imaging and provisioning operations.
Mitigation strategies for this vulnerability require immediate implementation of security patches from microsoft as well as network-based controls to limit access to Windows Deployment Services. Organizations should implement strict firewall rules that restrict access to the deployment services ports to only trusted networks and IP addresses, while also monitoring for unusual network traffic patterns that might indicate exploitation attempts. System administrators should disable Windows Deployment Services on systems where it is not required and ensure that automatic updates are configured to apply security patches promptly. The use of memory corruption detection tools and exploit mitigation technologies such as address space layout randomization and data execution prevention can help reduce the effectiveness of exploitation attempts. Additionally, network segmentation strategies should isolate deployment services from critical business infrastructure, and regular vulnerability assessments should monitor for systems running outdated versions of Windows Deployment Services that may still be vulnerable to this use-after-free condition.