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No exploitation reportedFix available

CVE-2017-7543

No exploitation reported by the sources we read.

  • Published2018-07-26
  • WeaknessCWE-362

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2018-07-2614:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-7543?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-7543?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Redhat openstackversion to verify
BranchAffectedFixed in
6.0= 6.0no fix published
7.0= 7.0no fix published
8.x= 8no fix published
9.x= 9no fix published
10.x= 10no fix published
11.x= 11no fix published
Openstack neutron
BranchAffectedFixed in
10.0≥ 10.0.0, < 10.0.2-1.110.0.2-1.1
9.x≥ 9.0.0, < 9.3.1-2.19.3.1-2.1
8.x≥ 8.0.0, < 8.3.0-11.18.3.0-11.1
7.x≥ 7.0.0, < 7.2.0-12.17.2.0-12.1
7.2< 7.2.0-12.17.2.0-12.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CNACVSS 3.05.3read 2026-10-23
  • NVDCVSS 3.05.9read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-362read 2026-10-23
  • NVDweakness (CWE)CWE-362read 2026-10-23
  • FIRST EPSSEPSS score1.8 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2018-07-26
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2017-7543?

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.

Is CVE-2017-7543 actively exploited?

Active exploitation of CVE-2017-7543 has not been confirmed. Its EPSS score was 1.8% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-7543?

CVE-2017-7543 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

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