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Vulnerability record · CVE-2018-17205 · published 19 September 2018

CVE-2018-17205: Openvswitch vulnerability

Openvswitch · Openvswitch

An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting ofproto_rule_insert__ in ofproto/ofproto.c. During bundle commit, flows that are added in a bundle are applied to ofproto in order. If a flow cannot be added (e.g., the flow action is a go-to for a group id that does not exist), OvS tries to revert back all previous flows that were successfully applied from the same bundle. This is possible since OvS maintains list of old flows that were replaced by flows from the bundle. While reinserting old flows, OvS has an assertion failure due to a check on rule state != RULE_INITIALIZED. This would work for new flows, but for an old flow the rule state is RULE_REMOVED. The assertion failure causes an OvS crash.

7.5 CVSS 3.0 High EPSS 2.5% · top 15.7% CWE-617 · CWE-617
7.5CVSS 3.0 base score, v2 5.0
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting ofproto_rule_insert__ in ofproto/ofproto.c. During bundle commit, flows that are added in a bundle are applied to ofproto in order. If a flow cannot be added (e.g., the flow action is a go-to for a group id that does not exist), OvS tries to revert back all previous flows that were successfully applied from the same bundle. This is possible since OvS maintains list of old flows that were replaced by flows from the bundle. While reinserting old flows, OvS has an assertion failure due to a check on rule state != RULE_INITIALIZED. This would work for new flows, but for an old flow the rule state is RULE_REMOVED. The assertion failure causes an OvS crash.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2018:3500 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0053 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0081 Third Party Advisory
https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6 ExploitPatchThird Party Advisory
https://usn.ubuntu.com/3873-1/ Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3500 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0053 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0081 Third Party Advisory
https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6 ExploitPatchThird Party Advisory
https://usn.ubuntu.com/3873-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-17205), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.