CVE-2025-27464
Windows Xen PV driver (XenBus) permits local privilege escalation
Is CVE-2025-27464 being exploited?
Not confirmed. CVE-2025-27464 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-2025-27464?
CVE-2025-27464 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-2025-27464?
Yes. A fix has been recorded for CVE-2025-27464. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-27464 affect?
CVE-2025-27464 affects Windows PV drivers (XenBus), XenIface, XenCons, Windows guests on Xen hypervisors. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-27464?
Apply vendor patch when released; restrict local accounts; remove PV drivers if unused; monitor for local escalation.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local unprivileged users can access PV interfaces (XenBus/XenIface/XenCons) to escalate to SYSTEM, enabling full guest compromise.
Immediate action required