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Fencer Intel
critical 9.1

CVE-2019-15753 json

OpenStack os-vif Ageing time of 0 disables linuxbridge MAC learning

published 7y ago modified 4mo ago also GHSA-mcpw-cp35-p3h8 , PYSEC-2026-440 , EUVD-2022-4542

cvss
9.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi os-vif 1.15.2, 1.17.0
  • openstack os-vif 1.15.2
  • python-os-vif Debian 14, Debian 13, Debian 12 1.15.2-1

debian advisories DEBIAN-CVE-2019-15753

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-15753 updated cvss 5.2

python-os-vif: Hard-coded MAC aging time of 0 disables MAC learning in linuxbridge

  • Red Hat OpenStack Platform 15 (Stein) python3-os-vif
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 10 (Newton) python-os-vif Red Hat OpenStack Platform 13 (Queens) python-os-vif, python2-os-vif Red Hat OpenStack Platform 14 (Rocky) python2-os-vif
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.61% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P
GitHub 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
OSV 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi os-vif
>=1.15.0, <1.15.2
>=1.16.0, <1.17.0
1.15.2
1.17.0

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.