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Vulnerability record · CVE-2018-17204 · published 19 September 2018

CVE-2018-17204: Openvswitch vulnerability

Openvswitch · Openvswitch

An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting parse_group_prop_ntr_selection_method in lib/ofp-util.c. When decoding a group mod, it validates the group type and command after the whole group mod has been decoded. The OF1.5 decoder, however, tries to use the type and command earlier, when it might still be invalid. This causes an assertion failure (via OVS_NOT_REACHED). ovs-vswitchd does not enable support for OpenFlow 1.5 by default.

4.3 CVSS 3.1 Medium EPSS 1.9% · top 21.0% CWE-617 · CWE-617
4.3CVSS 3.1 base score, v2 4.0
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting parse_group_prop_ntr_selection_method in lib/ofp-util.c. When decoding a group mod, it validates the group type and command after the whole group mod has been decoded. The OF1.5 decoder, however, tries to use the type and command earlier, when it might still be invalid. This causes an assertion failure (via OVS_NOT_REACHED). ovs-vswitchd does not enable support for OpenFlow 1.5 by default.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected products

4 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/4af6da3b275b764b1afe194df6499b33d2bf4cde PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html Mailing ListThird 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/4af6da3b275b764b1afe194df6499b33d2bf4cde PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/3873-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-17204), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.