What is CVE-2025-27466?

CVE-2025-27466 is a critical-severity vulnerability in Xen, classified under CWE-395. CVSS score: 9.8/10. Published 2025-09-11.

How severe is CVE-2025-27466?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-27466 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Xen

CVE-2025-27466

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] There are multiple issues related to the handling and accessing of guest memory pages in the viridian code: …

EPSS: 0.004 (34.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Xen — versions consult Xen advisory XSA-472

Weakness classification (CWE)

CWE-395

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

Frequently asked questions

What is CVE-2025-27466?: CVE-2025-27466 is a critical-severity vulnerability in Xen, classified under CWE-395. CVSS score: 9.8/10. Published 2025-09-11.
How severe is CVE-2025-27466?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-27466 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.