How severe is CVE-2011-2901?

CVE-2011-2901 has a CVSS 2.0 base score of 5.5, rated medium severity.

Is CVE-2011-2901 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2901?

CVE-2011-2901 primarily affects Xen. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-2901?

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

When was CVE-2011-2901 published?

CVE-2011-2901 was published on 2013-10-01 and last updated on 2026-06-16.

CVE-2011-2901

CVE-2011-2901 is a medium-severity vulnerability in Xen with a CVSS 2.0 base score of 5.5. 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-399.

Key facts

Severity: Medium (CVSS 2.0 base score 5.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Xen
Published: 2013-10-01
Last modified: 2026-06-16

Description

Off-by-one error in the __addr_ok macro in Xen 3.3 and earlier allows local 64 bit PV guest administrators to cause a denial of service (host crash) via unspecified hypercalls that ignore virtual-address bits.

Frequently asked questions

What is CVE-2011-2901?: Off-by-one error in the __addr_ok macro in Xen 3.3 and earlier allows local 64 bit PV guest administrators to cause a denial of service (host crash) via unspecified hypercalls that ignore virtual-address bits.
How severe is CVE-2011-2901?: CVE-2011-2901 has a CVSS 2.0 base score of 5.5, rated medium severity.
Is CVE-2011-2901 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2901?: CVE-2011-2901 primarily affects Xen. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-2901?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-2901 published?: CVE-2011-2901 was published on 2013-10-01 and last updated on 2026-06-16.

References

Affected products (10)

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:3.0.2:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:3.0.3:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:3.0.4:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:3.1.3:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:3.1.4:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:3.2.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:3.2.1:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:3.2.2:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:3.2.3:*:*:*:*:*:*:*

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