Vulnerability in Citrix Xenserver
CVE-2016-9382
Xen 4.0.x through 4.7.x mishandle x86 task switches to VM86 mode, which allows local 32-bit x86 HVM guest OS users to gain privileges or cause a denial of service (guest OS crash) by leveraging a guest operating system that uses hardware task switching and allows a new task to start in VM86 mode.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (36.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Citrix Xenserver — versions 6.0.2, 6.2.0, 6.5
- Xen — versions 4.0.0, 4.0.1, 4.0.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/94470 (VDB Entry, Third Party Advisory, vdb-entry)
- security.gentoo.org/glsa/201612-56 (vendor-advisory)
- xenbits.xen.org/xsa/advisory-192.html (Patch, Vendor Advisory)
- www.securitytracker.com/id/1037341 (VDB Entry, Third Party Advisory, vdb-entry)
- support.citrix.com/article/CTX218775 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-9382?
- CVE-2016-9382 is a high-severity vulnerability in Citrix Xenserver, classified under CWE-264. CVSS score: 7.8/10. Published 2017-01-23.
- How severe is CVE-2016-9382?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2016-9382 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.