CVE-2025-29966: Heap-based buffer overflow in Windows Remote Desktop allows an unauthorized attacker to execute code over a ne
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CVE-2025-29966 is a high-severity flaw (CVSS 8.8) affecting remote desktop, windows app, windows 10 1507. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Heap-based buffer overflow in Windows Remote Desktop allows an unauthorized attacker to execute code over a network.
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
microsoft windows 10 1507 UPGRADE
Affected: < 10.0.10240.21014
Fixed in: 10.0.10240.21014
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 1607 UPGRADE
Affected: < 10.0.14393.8066
Fixed in: 10.0.14393.8066
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 1809 UPGRADE
Affected: < 10.0.17763.7314
Fixed in: 10.0.17763.7314
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 21h2 UPGRADE
Affected: < 10.0.19044.5854
Fixed in: 10.0.19044.5854
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official sourceNVD · CVE Program · Report a problem with this page Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-29966?
remote desktop: upgrade to 1.2.6228.0; windows app: upgrade to 2.0.420; windows 10 1507: upgrade to 10.0.10240.21014. Exact commands for each OS are on this page.
Is CVE-2025-29966 being exploited?
CVE-2025-29966 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-29966 affect?
CVE-2025-29966 affects remote desktop, windows app, windows 10 1507. Severity is high (CVSS 8.8). Heap-based buffer overflow in Windows Remote Desktop allows an unauthorized attacker to execute code over a network.
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