SB2025040858 - Multiple vulnerabilities in Microsoft Windows Remote Desktop Services

Description

This security bulletin contains information about 3 vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2025-27480)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Windows Remote Desktop Services. A remote attacker can connect to a system with the Remote Desktop Gateway role and execute arbitrary code on the system.

2) Sensitive Data Storage in Improperly Locked Memory (CVE-ID: CVE-2025-27482)

CWE-ID: CWE-591 - Sensitive Data Storage in Improperly Locked Memory

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to sensitive data storage in improperly locked memory in Windows Remote Desktop Services. A remote attacker can win a race condition and execute arbitrary code on the target system.

3) Use-after-free (CVE-ID: CVE-2025-26671)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Windows Remote Desktop Services. A remote attacker can connect to a system with the Remote Desktop Gateway role, win a race condition and execute arbitrary code on the system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-27480
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-27482
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-26671