What is CVE-2015-8553?

CVE-2015-8553 is a medium-severity vulnerability in Xen, classified under Information Disclosure. CVSS score: 6.5/10. Published 2016-04-13.

How severe is CVE-2015-8553?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2015-8553 known to be exploited?

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

Information disclosure in Xen

CVE-2015-8553

Xen allows guest OS users to obtain sensitive information from uninitialized locations in host OS kernel memory by not enabling memory and I/O decoding control bits. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-0777.

Vulnerability class: Information Disclosure

Published 2016-04-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (29.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.5% 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
Red Hat Enterprise Linux — versions 5

Weakness classification (CWE)

CWE-200 — Information Disclosure

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

xenbits.xen.org/xsa/advisory-120.html (Patch, Vendor Advisory)
seclists.org/bugtraq/2019/Aug/18 (mailing-list)
www.debian.org/security/2019/dsa-4497 (vendor-advisory)

Frequently asked questions

What is CVE-2015-8553?: CVE-2015-8553 is a medium-severity vulnerability in Xen, classified under Information Disclosure. CVSS score: 6.5/10. Published 2016-04-13.
How severe is CVE-2015-8553?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2015-8553 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.