CVE-2016-9637: citrix xenserver
Vulnerability summary
CVE-2016-9637 is a high (CVSS 7.5) vulnerability in citrix xenserver. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 30.3% of scored vulnerabilities.
Not severe (CVSS 7.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 7Timeline
- 16-02-2017PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
The (1) ioport_read and (2) ioport_write functions in Xen, when qemu is used as a device model within Xen, might allow local x86 HVM guest OS administrators to gain qemu process privileges via vectors involving an out-of-range ioport access.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · Red hatEcosystem advisory · calculated7.6HighCVSS:3.0/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.36%
Chance of exploitation in the next 30 days
Percentile
30%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.36% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat4 products
- xen< 0:3.0.3-148.el5_11
- xen-debuginfo< 0:3.0.3-148.el5_11
- xen-devel< 0:3.0.3-148.el5_11
- xen-libs< 0:3.0.3-148.el5_11
Citrix1 product
- xenserver6.0.2 | 6.2.0:sp1 | 6.5:sp1 | 7.0
Debian1 product
- xen< 4.4.0-1
Ubuntu1 product
- xen< 4.4.2-0ubuntu0.14.04.9
4 vendors · 7 products
References
18 links- support.citrix.com/article/CTX219136X Refsource CONFIRM
