What is CVE-2019-17347?

CVE-2019-17347 is a high-severity vulnerability in Xen, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2019-10-08.

How severe is CVE-2019-17347?

High severity. CVSS v3 base score is 7.8 out of 10.

Improper input validation in Xen

CVE-2019-17347

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service or gain privileges because a guest can manipulate its virtualised %cr4 in a way that is incompatible with Linux (and possibly other guest kernels).

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

Published 2019-10-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (26.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.4% 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

Xen
Debian Linux — versions 9.0, 10.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

xenbits.xen.org/xsa/advisory-293.html (Patch, Vendor Advisory)
xenbits.xen.org/xsa/advisory-293.html (Vendor Advisory)
www.openwall.com/lists/oss-security/2019/10/25/8 (mailing-list, Mailing List)
www.debian.org/security/2020/dsa-4602 (vendor-advisory, Third Party Advisory)
seclists.org/bugtraq/2020/Jan/21 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2019-17347?: CVE-2019-17347 is a high-severity vulnerability in Xen, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2019-10-08.
How severe is CVE-2019-17347?: High severity. CVSS v3 base score is 7.8 out of 10.