Meltdown — Citrix Xenserver Vulnerability
CVE-2018-19965
An issue was discovered in Xen through 4.11.x allowing 64-bit PV guest OS users to cause a denial of service (host OS crash) because #GP[0] can occur after a non-canonical address is passed to the TLB flushing code. NOTE: this issue exists because of an incorrect CVE-2017-5754 (aka Meltdown) mitigation.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (32.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Citrix Xenserver — versions 7.0, 7.1, 7.5
- Xen
- Debian Linux — versions 9.0
Public proof-of-concept exploits
References
- support.citrix.com/article/CTX239432 (Patch, Third Party Advisory)
- xenbits.xen.org/xsa/advisory-279.html (Patch, Mitigation, Vendor Advisory)
- www.debian.org/security/2019/dsa-4369 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/106182 (VDB Entry, Third Party Advisory, vdb-entry)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-04/msg00072.html (vendor-advisory)
Frequently asked questions
- What is CVE-2018-19965?
- CVE-2018-19965 is a medium-severity vulnerability in Citrix Xenserver. CVSS score: 5.6/10. Published 2018-12-08.
- How severe is CVE-2018-19965?
- Medium severity. CVSS v3 base score is 5.6 out of 10.
- Is CVE-2018-19965 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.