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CVE-2025-21309 is a remote code execution vulnerability in Windows Remote Desktop Services. Available reporting describes the flaw as stemming from a race condition that leads to a use-after-free condition in the Remote Desktop Services component. In affected Remote Desktop Gateway or exposed RDP-related deployments, a remote attacker may be able to trigger the memory corruption condition and execute arbitrary code on the target system. The vulnerability has been described as not requiring user interaction, and reporting indicates it may be exploitable without valid login credentials in exposed configurations.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability in Windows Remote Desktop Services caused by a race condition leading to a use-after-free condition.
A remote code execution vulnerability in Windows Remote Desktop Services.
A critical remote code execution vulnerability in Windows Remote Desktop Services caused by storing sensitive data in improperly locked memory, exploitable against systems configured as Remote Desktop Gateway.
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.