libvirt version before 4.2.0-rc1 is vulnerable to a resource exhaustion as a result of an incomplete fix for CVE-2018-5748 that affects QEMU monitor but now also triggered via QEMU guest agent.
https://access.redhat.com/errata/RHSA-2018:1396
https://access.redhat.com/errata/RHSA-2018:1929
https://bugzilla.redhat.com/show_bug.cgi?id=1550672
https://libvirt.org/git/?p=libvirt.git;a=commit;h=fbf31e1a4cd19d6f6e33e0937a009775cd7d9513
https://lists.debian.org/debian-lts-announce/2018/03/msg00018.html
Source: MITRE
Published: 2018-03-28
Updated: 2018-06-20
Type: CWE-400
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH