SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2017-7543

The race was only triggered by an update, at which point an attacker could access exposed tenant VMs and network resources.

MEDIUM 5.9EPSS 1.84%

Does this matter?

Lower severity and a low EPSS score (1.84%). Track it; it rarely justifies an emergency change on its own.

Description

A race-condition flaw was discovered in openstack-neutron before 7.2.0-12.1, 8.x before 8.3.0-11.1, 9.x before 9.3.1-2.1, and 10.x before 10.0.2-1.1, where, following a minor overcloud update, neutron security groups were disabled. Specifically, the following were reset to 0: net.bridge.bridge-nf-call-ip6tables and net.bridge.bridge-nf-call-iptables. The race was only triggered by an update, at which point an attacker could access exposed tenant VMs and network resources.

CVSS 3.0
5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
1.84% probability · 79th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-362
Affected
openstack/neutron · redhat/openstack
Source
secalert@redhat.com
EPSS trend
0%3%5%27 October 2026: 1.84%27 October 202627 October 2026

EPSS 1.8% 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

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