What’s Vulnerable › Vulnerabilities

CVE-2019-15753

• Severity: critical (CVSS 9.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-08-28 · updated 2026-06-17
• Weakness: CWE-770

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.

Affected products

• OpenStack Os-Vif: from 1.15.0 before 1.15.2; 1.16.0 — fixed in 1.15.2

How to fix

Upgrade to a fixed version: OpenStack Os-Vif 1.15.2. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2019/08/29/2
• https://launchpad.net/bugs/1837252
• https://review.opendev.org/672834
• https://review.opendev.org/678098
• https://security.openstack.org/ossa/OSSA-2019-004.html
• http://www.openwall.com/lists/oss-security/2019/08/29/2
• https://launchpad.net/bugs/1837252
• https://review.opendev.org/672834
• https://review.opendev.org/678098
• https://security.openstack.org/ossa/OSSA-2019-004.html

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