Is CVE-2025-27466 in the CISA KEV catalog?

No. CVE-2025-27466 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-27466?

CVE-2025-27466 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2025-27466?

CVE-2025-27466 has an EPSS score of 0.43% (35th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-27466?

Upgrade xen on debian 12 to 4.17.5+72-g01140da4e8-1 or later.

CVE & CISA-KEV Catalog

CVE-2025-27466

CRITICAL

9.8

CVSS v3

NVD

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.

CWE-395

How to fix

Remediation Available

xenDebian

Fixed in:4.17.5+72-g01140da4e8-1CVE-2025-27466

Fixed in:4.20.2+7-g1badcf5035-0+deb13u1CVE-2025-27466

Fixed in:4.20.2+7-g1badcf5035-1CVE-2025-27466

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.43%probability of exploitation in 30 days

35thpercentile

Low risk: more likely to be exploited than 35% of all known CVEs.

References

Vendor Advisory1

xenbits.xenproject.org

Other references2

Related Vulnerabilities

Other CWE-395 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-2832	High	7.5	1.5%	-	-
CVE-2025-15514	High	7.5	0.7%	-	-
CVE-2024-27659	Medium	6.5	0.6%	-	-
CVE-2024-27658	Medium	6.5	0.6%	-	-
CVE-2025-58142	Critical	9.8	0.4%	-	Fix
CVE-2024-27662	Medium	6.5	0.4%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-04.