Is CVE-2023-34327 in the CISA KEV catalog?

No. CVE-2023-34327 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-34327?

CVE-2023-34327 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2023-34327?

CVE-2023-34327 has an EPSS score of 0.26% (17th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-34327?

Upgrade xen on debian 12 to 4.17.2+76-ge1f9cb16e2-1~deb12u1 or later.

CVE & CISA-KEV Catalog

CVE-2023-34327

MEDIUM

5.5

CVSS v3

NVD

Description

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] AMD CPUs since ~2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service. 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of a previous vCPUs debug mask state. 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT. This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock up the CPU entirely.

How to fix

Remediation Available

xenDebian

Fixed in:4.17.2+76-ge1f9cb16e2-1~deb12u1CVE-2023-34327

Fixed in:4.17.2+55-g0b56bed864-1CVE-2023-34327

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.26%probability of exploitation in 30 days

17thpercentile

Low risk: more likely to be exploited than 17% of all known CVEs.

References

Patch1

xenbits.xenproject.org

Other references1

xenbits.xen.org

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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.