How severe is CVE-2014-9066?

CVE-2014-9066 has a CVSS 2.0 base score of 4.7, rated medium severity.

Is CVE-2014-9066 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-9066?

CVE-2014-9066 primarily affects Xen. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-9066?

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

When was CVE-2014-9066 published?

CVE-2014-9066 was published on 2014-12-09 and last updated on 2026-06-17.

CVE-2014-9066

CVE-2014-9066 is a medium-severity vulnerability in Xen with a CVSS 2.0 base score of 4.7. 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-17.

Key facts

Severity: Medium (CVSS 2.0 base score 4.7)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-17
Affected product: Xen
Published: 2014-12-09
Last modified: 2026-06-17

Description

Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.

Frequently asked questions

What is CVE-2014-9066?: Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.
How severe is CVE-2014-9066?: CVE-2014-9066 has a CVSS 2.0 base score of 4.7, rated medium severity.
Is CVE-2014-9066 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-9066?: CVE-2014-9066 primarily affects Xen. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-9066?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2014-9066 published?: CVE-2014-9066 was published on 2014-12-09 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

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