How severe is CVE-2025-27465?

CVE-2025-27465 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-27465 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27465?

CVE-2025-27465 affects Xen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-27465?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-27465 have an EU (EUVD) identifier?

Yes. CVE-2025-27465 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21593.

When was CVE-2025-27465 published?

CVE-2025-27465 was published on 2025-07-16 and last updated on 2026-06-17.

CVE-2025-27465

CVE-2025-27465 is a medium-severity vulnerability in Xen with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-755.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-21593
Weakness: CWE-755
Affected product: Xen
Published: 2025-07-16
Last modified: 2026-06-17

Description

Certain instructions need intercepting and emulating by Xen. In some cases Xen emulates the instruction by replaying it, using an executable stub. Some instructions may raise an exception, which is supposed to be handled gracefully. Certain replayed instructions have additional logic to set up and recover the changes to the arithmetic flags. For replayed instructions where the flags recovery logic is used, the metadata for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating it as fatal instead.

Frequently asked questions

What is CVE-2025-27465?: Certain instructions need intercepting and emulating by Xen. In some cases Xen emulates the instruction by replaying it, using an executable stub. Some instructions may raise an exception, which is supposed to be handled gracefully. Certain replayed instructions have additional logic to set up and recover the changes to the arithmetic flags. For replayed instructions where the flags recovery logic is used, the metadata for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating it as fatal instead.
How severe is CVE-2025-27465?: CVE-2025-27465 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-27465 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27465?: CVE-2025-27465 affects Xen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27465?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-27465 have an EU (EUVD) identifier?: Yes. CVE-2025-27465 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21593.
When was CVE-2025-27465 published?: CVE-2025-27465 was published on 2025-07-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*

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