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CVE-2016-9385

22
FAUCET Score

CVE-2016-9385 is a denial-of-service vulnerability affecting Xen 4.4.x through 4.7.x, including Citrix XenServer, where local x86 PV guest OS administrators can crash the host due to a lack of canonical address checks in the x86 segment base write emulation. With a CVSS score of 6.0 (Medium), this vulnerability requires high privileges (PR:H) and local access (AV:L) to achieve a high impact on availability (A:H). There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
4.4.0CPE matchmatch criteria
cpe:2.3:o:xen:xen:4.4.0:*:*:*:*:*:*:*
4.4.1CPE matchmatch criteria
cpe:2.3:o:xen:xen:4.4.1:*:*:*:*:*:*:*
4.4.2CPE matchmatch criteria
cpe:2.3:o:xen:xen:4.4.2:*:*:*:*:*:*:*
4.4.3CPE matchmatch criteria
cpe:2.3:o:xen:xen:4.4.3:*:*:*:*:*:*:*
4.4.4CPE matchmatch criteria
cpe:2.3:o:xen:xen:4.4.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.0MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.5
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.43%
Probability of exploitation in next 30 days
EPSS Percentile
35.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0043 is in the 85th percentile among its peer group of 3,720 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

citrixpatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2016-9385Moderate

xen: x86 segment base write emulation lacking canonical address checks (XSA-193)

Nov 22, 2016

References

security.gentoo.org / glsa/201612-56
support.citrix.com / article/CTX218775
PatchThird Party AdvisoryVDB Entry
securityfocus.com / bid/94472
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037342
Third Party AdvisoryVDB Entry
xenbits.xen.org / xsa/advisory-193.html
PatchVendor Advisory