VulnerabilityModified

CVE-2019-15753

CRITICAL 9.1EPSS 2.61%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (2.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.0: 9.1 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS: 2.61% probability · 85th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-770
Affected: openstack/os-vif
Source: cve@mitre.org

EPSS trend

EPSS 2.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

http://www.openwall.com/lists/oss-security/2019/08/29/2Mailing List, Patch, Third Party Advisory
https://launchpad.net/bugs/1837252Issue Tracking, Third Party Advisory
https://review.opendev.org/672834Patch
https://review.opendev.org/678098Patch
https://security.openstack.org/ossa/OSSA-2019-004.htmlPatch, Vendor Advisory
http://www.openwall.com/lists/oss-security/2019/08/29/2Mailing List, Patch, Third Party Advisory
https://launchpad.net/bugs/1837252Issue Tracking, Third Party Advisory
https://review.opendev.org/672834Patch
https://review.opendev.org/678098Patch
https://security.openstack.org/ossa/OSSA-2019-004.htmlPatch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.