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No exploitation reportedFix available

CVE-2018-17205

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 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.

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

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

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2018-17205 Red Hat Product Security51 products fixed · 13 known affected

    openvswitch: Error during bundle commit in ofproto/ofproto.c:ofproto_rule_insert__() allows for crash

    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) · +10 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

  • 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. No fix available, says the vendor Red Hat Product Security CVE-2018-17205 · 2 productsAffected
  3. No fix planned, says the vendor Red Hat Product Security CVE-2018-17205 · 11 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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2018-09-19
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-vxv4-rrx9-5xfq

Frequently asked questions

What is CVE-2018-17205?

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.

Is CVE-2018-17205 actively exploited?

Active exploitation of CVE-2018-17205 has not been confirmed. Its EPSS score was 2.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-17205?

CVE-2018-17205 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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