How severe is CVE-2014-1666?

CVE-2014-1666 has a CVSS 2.0 base score of 8.3, rated high severity.

Is CVE-2014-1666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-1666?

CVE-2014-1666 primarily affects Xen. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-1666?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2014-1666 published?

CVE-2014-1666 was published on 2014-01-26 and last updated on 2026-06-17.

CVE-2014-1666

CVE-2014-1666 is a high-severity vulnerability in Xen with a CVSS 2.0 base score of 8.3. 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-264.

Key facts

Severity: High (CVSS 2.0 base score 8.3)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Xen
Published: 2014-01-26
Last modified: 2026-06-17

Description

The do_physdev_op function in Xen 4.1.5, 4.1.6.1, 4.2.2 through 4.2.3, and 4.3.x does not properly restrict access to the (1) PHYSDEVOP_prepare_msix and (2) PHYSDEVOP_release_msix operations, which allows local PV guests to cause a denial of service (host or guest malfunction) or possibly gain privileges via unspecified vectors.

Frequently asked questions

What is CVE-2014-1666?: The do_physdev_op function in Xen 4.1.5, 4.1.6.1, 4.2.2 through 4.2.3, and 4.3.x does not properly restrict access to the (1) PHYSDEVOP_prepare_msix and (2) PHYSDEVOP_release_msix operations, which allows local PV guests to cause a denial of service (host or guest malfunction) or possibly gain privileges via unspecified vectors.
How severe is CVE-2014-1666?: CVE-2014-1666 has a CVSS 2.0 base score of 8.3, rated high severity.
Is CVE-2014-1666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-1666?: CVE-2014-1666 primarily affects Xen. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-1666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2014-1666 published?: CVE-2014-1666 was published on 2014-01-26 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:o:xen:xen:4.1.5:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.1.6.1:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.2.2:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.2.3:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:*

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