openvswitch: Mishandle of group mods in lib/ofp-util.c:parse_group_prop_ntr_selection_method() allows for assertion failure
Published Sep 19, 2018
4.3
MEDIUMCVSS 3.1
EPSS 1.91%
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.
Affected products
No data.
Configuration 1
- ≥ 2.7.0 · ≤ 2.7.6
Configuration 3
- 16.04
- 18.04
Configuration 4
- 9.0
No data.
Fast Datapath for Red Hat Enterprise Linux 7
openvswitch-0:2.9.0-70.el7fdp.1
Fixed · RHSA-2018:3500
Red Hat OpenStack Platform 10.0 (Newton)
openvswitch-0:2.9.0-83.el7fdp.1
Fixed · RHSA-2019:0053
Red Hat OpenStack Platform 13.0 (Queens)
openvswitch-0:2.9.0-83.el7fdp.1
Fixed · RHSA-2019:0081
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7
redhat-release-virtualization-host-0:4.2-7.5.el7
Fixed · RHBA-2018:3683
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7
redhat-virtualization-host-0:4.2-20181121.0.el7_6
Fixed · RHBA-2018:3683
Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUS
openvswitch-0:2.9.0-70.el7fdp.1
Fixed · RHSA-2018:3500
Fast Datapath for RHEL 7
openvswitch2.10
Not affected
Fast Datapath for RHEL 8
openvswitch2.10
Not affected
Fast Datapath for RHEL 8
openvswitch2.11
Not affected
Red Hat OpenShift Container Platform 3.2
node
Not affected
Red Hat OpenShift Container Platform 3.3
node
Not affected
Red Hat OpenShift Container Platform 3.4
node
Not affected
Red Hat OpenShift Enterprise 3.0
openvswitch
Not affected
Red Hat OpenShift Enterprise 3.1
node
Not affected
Red Hat OpenStack Platform 12 (Pike)
openvswitch
Will not fix
Red Hat OpenStack Platform 14 (Rocky)
openvswitch
Not affected
Red Hat OpenStack Platform 8 (Liberty)
openvswitch
Will not fix
Red Hat OpenStack Platform 9 (Mitaka)
openvswitch
Will not fix
Red Hat Virtualization 4
rhvm-appliance
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Fast Datapath for Red Hat Enterprise Linux 7 | openvswitch-0:2.9.0-70.el7fdp.1 | Fixed | RHSA-2018:3500 |
| Red Hat OpenStack Platform 10.0 (Newton) | openvswitch-0:2.9.0-83.el7fdp.1 | Fixed | RHSA-2019:0053 |
| Red Hat OpenStack Platform 13.0 (Queens) | openvswitch-0:2.9.0-83.el7fdp.1 | Fixed | RHSA-2019:0081 |
| Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 | redhat-release-virtualization-host-0:4.2-7.5.el7 | Fixed | RHBA-2018:3683 |
| Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 | redhat-virtualization-host-0:4.2-20181121.0.el7_6 | Fixed | RHBA-2018:3683 |
| Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUS | openvswitch-0:2.9.0-70.el7fdp.1 | Fixed | RHSA-2018:3500 |
| Fast Datapath for RHEL 7 | openvswitch2.10 | Not affected | n/a |
| Fast Datapath for RHEL 8 | openvswitch2.10 | Not affected | n/a |
| Fast Datapath for RHEL 8 | openvswitch2.11 | Not affected | n/a |
| Red Hat OpenShift Container Platform 3.2 | node | Not affected | n/a |
| Red Hat OpenShift Container Platform 3.3 | node | Not affected | n/a |
| Red Hat OpenShift Container Platform 3.4 | node | Not affected | n/a |
| Red Hat OpenShift Enterprise 3.0 | openvswitch | Not affected | n/a |
| Red Hat OpenShift Enterprise 3.1 | node | Not affected | n/a |
| Red Hat OpenStack Platform 12 (Pike) | openvswitch | Will not fix | n/a |
| Red Hat OpenStack Platform 14 (Rocky) | openvswitch | Not affected | n/a |
| Red Hat OpenStack Platform 8 (Liberty) | openvswitch | Will not fix | n/a |
| Red Hat OpenStack Platform 9 (Mitaka) | openvswitch | Will not fix | n/a |
| Red Hat Virtualization 4 | rhvm-appliance | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
AV:N/AC:L/Au:S/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.91% (0.01911) | 79.09th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.91% (0.01911) | 77.06th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.19% (0.01194) | 77.44th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.20% (0.00202) | 59.07th | v3 (v2023.03.01) |
| Jul 4, 2024 | 0.20% (0.00202) | 58.46th | v3 (v2023.03.01) |
| Feb 10, 2024 | 0.29% (0.00286) | 67.94th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.41% (0.00407) | 73.11th | v3 (v2023.03.01) |
| Sep 13, 2023 | 0.41% (0.00407) | 70.58th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.59% (0.00588) | 75.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.37% (0.00373) | 68.38th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.03% (0.01034) | 41.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.03% (0.01034) | 20.32th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.45% (0.01454) | 32.67th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.45% (0.01454) | 0.00th | v1 |
References (10)
- https://access.redhat.com/errata/RHSA-2018:3500 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0053 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0081 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-17204 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1632522 Issue Tracking
- https://github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cde x_refsource_MISCPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-17204
- https://usn.ubuntu.com/3873-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-17204
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2018:3500 | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| https://access.redhat.com/errata/RHSA-2019:0053 | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| https://access.redhat.com/errata/RHSA-2019:0081 | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2018-17204 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1632522 | Issue Tracking | |
| https://github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cde | x_refsource_MISCPatchThird Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-17204 | ||
| https://usn.ubuntu.com/3873-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-17204 |
Change history (0)
No recorded changes yet.