CVE-2019-15753
OpenStack os-vif Ageing time of 0 disables linuxbridge MAC learning
9.1
CRITICAL
CVSS 3.1
EPSS 0.97%
Description
In OpenStack os-vif 1.15.x before 1.15.2, and 1.16.0, a hard-coded MAC aging time of 0 disables MAC learning in linuxbridge, forcing obligatory Ethernet flooding of non-local destinations, which both impedes network performance and allows users to possibly view the content of packets for instances belonging to other tenants sharing the same network. Only deployments using the linuxbridge backend are affected. This occurs in PyRoute2.add() in internal/command/ip/linux/impl_pyroute2.py.
How to fix CVE-2019-15753
To remediate CVE-2019-15753, upgrade the affected package to a fixed version below.
- —upgrade to 1.15.2-1 or later
- —upgrade to 1.15.2 or later
Is CVE-2019-15753 being exploited?
Low — EPSS is 1.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.15.2-1
- >= 1.15.0, < 1.15.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |