CVE-2025-27463
Local privilege escalation in Windows XenIface PV driver allowing unprivileged users SYSTEM access.
Is CVE-2025-27463 being exploited?
Not confirmed. CVE-2025-27463 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.16% probability of exploitation in the next 30 days.
How severe is CVE-2025-27463?
CVE-2025-27463 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-27463?
Yes. A fix has been recorded for CVE-2025-27463. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-27463 affect?
CVE-2025-27463 affects Windows PV drivers (XenIface), Windows guests on Xen hypervisors, Paravirtualized drivers: XenIface (related: XenCons, XenBus). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-27463?
Apply vendor patch ASAP; restrict or disable Xen PV drivers and block PV device access until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local attacker can access XenIface device and escalate to SYSTEM due to missing security descriptor.
Immediate action required