SB2025052759 - Citrix Hypervisor and XenServer update for XenServer VM Tools for Windows

Description

This security bulletin contains information about 3 vulnerabilities.

1) Exposed dangerous method or function (CVE-ID: CVE-2025-27462)

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

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

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to exposure of various facilities to the userspace in Windows PV drivers. A local unprivileged user on the guest OS can escalate privileges within he operating system.

2) Exposed dangerous method or function (CVE-ID: CVE-2025-27463)

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

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

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to exposure of various facilities to the userspace in Windows PV drivers. A local unprivileged user on the guest OS can escalate privileges within he operating system.

3) Exposed dangerous method or function (CVE-ID: CVE-2025-27464)

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

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

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to exposure of various facilities to the userspace in Windows PV drivers. A local unprivileged user on the guest OS can escalate privileges within he operating system.

Remediation

Install update from vendor's website.

References

• https://support.citrix.com/article/CTX692748