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CVE-2025-27466

9.8 · CRITICAL

[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…

Published Sep 11, 2025CWE-395EPSS 0.48%

Overview

CVE-2025-27466 is a critical-severity vulnerability. It was published on September 11, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

[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:

1. A NULL pointer dereference in the updating of the reference TSC area.

This is CVE-2025-27466.

2. A NULL pointer dereference by assuming the SIM page is mapped when

a synthetic timer message has to be delivered. This is

CVE-2025-58142.

3. A race in the mapping of the reference TSC page, where a guest can

get Xen to free a page while still present in the guest physical to

machine (p2m) page tables. This is CVE-2025-58143.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refxenbits.xenproject.org/xsa/advisory-472.htmlRefwww.openwall.com/lists/oss-security/2025/09/09/1Refxenbits.xen.org/xsa/advisory-472.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-27466?

CVE-2025-27466 is a critical-severity vulnerability. It was published on September 11, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-27466?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-27466?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-27466?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-27466 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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