libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
http://www.debian.org/security/2017/dsa-4003
https://access.redhat.com/security/cve/CVE-2017-1000256
https://www.mail-archive.com/[email protected]/msg1556251.html
https://www.redhat.com/archives/libvirt-announce/2017-October/msg00001.html
Source: MITRE
Published: 2017-10-31
Updated: 2020-11-16
Type: CWE-295
Base Score: 6.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 8.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.2
Severity: HIGH