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CVE-2025-29966 is a critical heap-based buffer overflow vulnerability in the Windows Remote Desktop Client. The flaw is described as occurring during RDP session initialization, where the client improperly handles memory associated with dynamically allocated buffers and fails to correctly validate the size of data received from a remote RDP server. A malicious server can send crafted oversized RDP packets that corrupt heap memory in the client, potentially overwriting adjacent memory structures and control data. Successful exploitation can result in arbitrary code execution on the client system. Available reporting consistently characterizes this issue as affecting the Remote Desktop Client and being triggerable when a vulnerable client connects to an attacker-controlled or malicious RDP server.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remote code execution vulnerability in Remote Desktop Client.
Remote Desktop Client remote code execution vulnerability.
A remote code execution vulnerability in Remote Desktop Client & Gateway Service, allowing arbitrary code execution on client and server systems.
A remote code execution vulnerability in the Remote Desktop Client.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.