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No exploitation reportedFix available

CVE-2018-17204

No exploitation reported by the sources we read.

  • Published2018-09-19
  • WeaknessCWE-617

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

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.

Timeline

dates in UTC
  1. 2018-09-1916:29CVE publishedNVD

Versions per branch

NVD
Openvswitch
BranchAffectedFixed in
2.7≥ 2.7.0, ≤ 2.7.6no fix published
Canonical ubuntu linux
BranchAffectedFixed in
16.4= 16.04no fix published
18.4= 18.04no fix published
Redhat openstack
BranchAffectedFixed in
10.x= 10no fix published
13.x= 13no fix published

1 more product in the sources.

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

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • openvswitchUbuntu:18.04:LTSall versions · fixed in 2.9.2-0ubuntu0.18.04.3
  • openvswitchUbuntu:16.04:LTSall versions · fixed in 2.5.5-0ubuntu0.16.04.2
  • openvswitchSUSE:Linux Enterprise Server for SAP Applications 12 SP3all versions · fixed in 2.7.6-3.23.1
  • openvswitchSUSE:Linux Enterprise Server 12 SP3all versions · fixed in 2.7.6-3.23.1
  • openvswitchRed Hat:openstack:13::el7all versions · fixed in 0:2.9.0-83.el7fdp.1and 7 other packages
  • openvswitchRed Hat:openstack:10::el7all versions · fixed in 0:2.9.0-83.el7fdp.1and 8 other packages
  • openvswitchRed Hat:enterprise_linux:7::hypervisorall versions · fixed in 0:2.9.0-70.el7fdp.1and 5 other packages
  • openvswitchRed Hat:enterprise_linux:7::fastdatapathall versions · fixed in 0:2.9.0-70.el7fdp.1and 8 other packages

6 more package ranges on OSV.dev

Vendor advisories

  • CVE-2018-17204 Red Hat Product Security56 products fixed · 16 known affected

    openvswitch: Mishandle of group mods in lib/ofp-util.c:parse_group_prop_ntr_selection_method() allows for assertion failure

    openvswitch as a component of Red Hat OpenStack Platform 12 (Pike) · openvswitch-devel as a component of Red Hat OpenStack Platform 12 (Pike) · openvswitch-ovn-central as a component of Red Hat OpenStack Platform 12 (Pike) · +13 more

  • RHSA-2019:0081 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: openvswitch security and bug fix update

  • RHSA-2019:0053 Red Hat Product Security10 products fixed

    Red Hat Security Advisory: openvswitch security and bug fix update

  • RHBA-2018:3683 Red Hat Product Security5 products fixed

    Red Hat Bug Fix Advisory: Important: redhat-virtualization-host bug fix and enhancement update

  • RHSA-2018:3500 Red Hat Product Security25 products fixed

    Red Hat Security Advisory: openvswitch security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2019:0081 · 16 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  2. Vendor fix Red Hat Product Security RHBA-2018:3683 · 5 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/2974891
  3. No fix planned, says the vendor Red Hat Product Security CVE-2018-17204 · 16 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Published
2018-09-19
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-4wv2-475w-c2fw

Frequently asked questions

What is CVE-2018-17204?

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.

Is CVE-2018-17204 actively exploited?

Active exploitation of CVE-2018-17204 has not been confirmed. Its EPSS score was 1.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-17204?

CVE-2018-17204 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

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