Improper input validation in Citrix Xenserver
CVE-2016-6259
Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service (hypervisor and VM crash) by triggering a safety check.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Citrix Xenserver — versions 6.0, 6.0.2, 6.1
- Xen — versions 4.5.0, 4.5.1, 4.5.2
Weakness classification (CWE)
References
- www.securityfocus.com/bid/92130 (Third Party Advisory, vdb-entry)
- support.citrix.com/article/CTX214954 (Vendor Advisory)
- www.securitytracker.com/id/1036447 (Third Party Advisory, vdb-entry)
- xenbits.xen.org/xsa/xsa183-unstable.patch (Patch, Mitigation)
- xenbits.xen.org/xsa/advisory-183.html (Patch, Mailing List)
- xenbits.xen.org/xsa/xsa183-4.6.patch (Patch, Mitigation)
Frequently asked questions
- What is CVE-2016-6259?
- CVE-2016-6259 is a medium-severity vulnerability in Citrix Xenserver, classified under Improper Input Validation. CVSS score: 6.2/10. Published 2016-08-02.
- How severe is CVE-2016-6259?
- Medium severity. CVSS v3 base score is 6.2 out of 10.