CVE-2019-9735: Debian Linux

Medium severity, CVSS 6.5. EPSS: 3.7% chance of exploitation in the next 30 days.

An issue was discovered in the iptables firewall module in OpenStack Neutron before 10.0.8, 11.x before 11.0.7, 12.x before 12.0.6, and 13.x before 13.0.3. By setting a destination port in a security group rule along with a protocol that doesn't support that option (for example, VRRP), an authenticated user may block further application of security group rules for instances from any project/tenant on the compute hosts to which it's applied. (Only deployments using the iptables security group driver are affected.)

Affected products

• Debian Debian Linux: version 9.0 only
• Openstack Neutron: before 10.0.8 (fixed in 10.0.8); from 11.0.0, before 11.0.7 (fixed in 11.0.7); from 12.0.0, before 12.0.6 (fixed in 12.0.6); from 13.0.0, before 13.0.3 (fixed in 13.0.3)
• Red Hat Openstack: version 10 only; version 13 only; version 14 only

Published 2019-03-13. Last modified 2026-06-17.