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CVE-2016-9637

19
FAUCET Score

CVE-2016-9637 describes a privilege escalation vulnerability in Xen, specifically when qemu is used as a device model. Local x86 HVM guest OS administrators could exploit out-of-range ioport access through the ioport_read and ioport_write functions to gain qemu process privileges. This vulnerability carries a CVSS v3 score of 7.5 (HIGH), indicating a high impact on confidentiality, integrity, and availability, with high attack complexity and requiring high privileges. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
6.0.2CPE matchmatch criteria
cpe:2.3:a:citrix:xenserver:6.0.2:*:*:*:*:*:*:*
6.2.0CPE matchmatch criteria
cpe:2.3:a:citrix:xenserver:6.2.0:sp1:*:*:*:*:*:*
6.5CPE matchmatch criteria
cpe:2.3:a:citrix:xenserver:6.5:sp1:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:a:citrix:xenserver:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.8
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.36%
Probability of exploitation in next 30 days
EPSS Percentile
29.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0036 is in the 77th percentile among its peer group of 160 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xen-0:3.0.3-148.el5_11
View patch

Vendor Advisories (1)

redhatCVE-2016-9637Important

Xen: qemu ioport out-of-bounds array access (XSA-199)

Dec 6, 2016

References

rhn.redhat.com / errata/RHSA-2016-2963.html
lists.debian.org / debian-lts-announce/2018/02/msg00005.html
security.gentoo.org / glsa/201612-56
support.citrix.com / article/CTX219136
securityfocus.com / bid/94699
securitytracker.com / id/1037397
xenbits.xen.org / xsa/advisory-199.html