What is CVE-2012-3495?

CVE-2012-3495 is a vulnerability in Citrix Xenserver, classified under Improper Input Validation. Published 2012-11-23.

Is CVE-2012-3495 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Citrix Xenserver

CVE-2012-3495

The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2012-11-23 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 6.1 (Medium). Vector: AV:L/AC:L/Au:N/C:P/I:P/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.004 (35.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Citrix Xenserver — versions 5.0, 5.5, 5.6
Xen — versions 4.1.0, 4.1.1, 4.1.2

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

hinj/hInjector

References

secunia.com/advisories/55082 (third-party-advisory)
xenbits.xen.org/hg/xen-4.1-testing.hg/rev/6779ddca8593
lists.xen.org/archives/html/xen-announce/2012-09/msg00001.html (mailing-list)
secunia.com/advisories/51413 (third-party-advisory)
security.gentoo.org/glsa/glsa-201309-24.xml (vendor-advisory)
wiki.xen.org/wiki/Security_Announcements
lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html (vendor-advisory)
www.securityfocus.com/bid/55406 (vdb-entry)
www.securitytracker.com/id (vdb-entry)
security.gentoo.org/glsa/201604-03 (vendor-advisory)

Frequently asked questions

What is CVE-2012-3495?: CVE-2012-3495 is a vulnerability in Citrix Xenserver, classified under Improper Input Validation. Published 2012-11-23.
Is CVE-2012-3495 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.