CVE-2025-58151
TOCTOU in Xapi varstored enables VM attacker to manipulate execution index, risking host compromise
Is CVE-2025-58151 being exploited?
Not confirmed. CVE-2025-58151 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 0.14% probability of exploitation in the next 30 days.
How severe is CVE-2025-58151?
CVE-2025-58151 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-2025-58151?
Yes. A fix has been recorded for CVE-2025-58151. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-58151 affect?
CVE-2025-58151 affects Xapi (varstored component), OVMF (UEFI in VM), Xen/XCP-ng/Citrix Hypervisor deployments using Xapi. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-58151?
Isolate untrusted VMs, restrict UEFI variable access, apply vendor patch when released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local VM attacker can exploit TOCTOU in varstored to control a jump-table index, enabling arbitrary code execution or host/management-domain compromise.
Immediate action required