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CVE-2016-9379

25
FAUCET Score

CVE-2016-9379 describes a vulnerability in the pygrub boot loader emulator within Xen, Citrix XenServer, and XenServer, allowing local guest OS administrators to read or delete arbitrary host files. With a CVSS v3 score of 7.9 (HIGH), this vulnerability has a low attack complexity and requires high privileges, but allows for significant impact on confidentiality and integrity. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
6.5CPE matchmatch criteria
cpe:2.3:a:citrix:xenserver:6.5:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:a:citrix:xenserver:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.9HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.5
Impact Score
5.8
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
36.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 78th percentile among its peer group of 358 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 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 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

citrixpatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xen

Vendor Advisories (1)

redhatCVE-2016-9379Moderate

xen: delimiter injection vulnerabilities in pygrub (XSA-198)

Nov 22, 2016

References

security.gentoo.org / glsa/201612-56
support.citrix.com / article/CTX218775
PatchThird Party Advisory
securityfocus.com / bid/94473
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037347
Third Party AdvisoryVDB Entry
xenbits.xen.org / xsa/advisory-198.html
PatchVendor Advisory
xenbits.xen.org / xsa/xsa198.patch
PatchVendor Advisory