What is CVE-2016-1571?

CVE-2016-1571 is a medium-severity vulnerability in Citrix Xenserver, classified under CWE-17. CVSS score: 6.3/10. Published 2016-01-22.

How severe is CVE-2016-1571?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Citrix Xenserver

CVE-2016-1571

The paging_invlpg function in include/asm-x86/paging.h in Xen 3.3.x through 4.6.x, when using shadow mode paging or nested virtualization is enabled, allows local HVM guest users to cause a denial of service (host crash) via a non-canonical guest address in an INVVPID instruction, which triggers a hypervisor bug check.

Published 2016-01-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (68.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Citrix Xenserver
Xen — versions 3.3.0, 3.3.1, 3.3.2

Weakness classification (CWE)

CWE-17

References

www.debian.org/security/2016/dsa-3519 (vendor-advisory)
www.securitytracker.com/id/1034745 (Third Party Advisory, vdb-entry)
support.citrix.com/article/CTX205496 (Third Party Advisory)
xenbits.xen.org/xsa/advisory-168.html (Vendor Advisory)

Frequently asked questions

What is CVE-2016-1571?: CVE-2016-1571 is a medium-severity vulnerability in Citrix Xenserver, classified under CWE-17. CVSS score: 6.3/10. Published 2016-01-22.
How severe is CVE-2016-1571?: Medium severity. CVSS v3 base score is 6.3 out of 10.