CVE-2018-17204: canonical ubuntu_linux Reachable Assertion
Vulnerability summary
CVE-2018-17204 is a medium (CVSS 4.3) Reachable Assertion vulnerability in canonical ubuntu_linux. EPSS estimates a 1.91% chance of exploitation in the next 30 days, higher than 79.8% of scored vulnerabilities.
Not severe (CVSS 4.3, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6 · Related 2Timeline
- 19-09-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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 metrics
6 scores · 4 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- OSV · DebianEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:LDiffers
EPSS trend
Probability
1.91%
Chance of exploitation in the next 30 days
Percentile
80%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.91% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat5 products
- openstack10 | 13
- redhat-release-virtualization-host< 0:4.2-7.5.el7
- redhat-virtualization-host< 0:4.2-20181121.0.el7_6
- redhat-virtualization-host-image-update< 0:4.2-20181121.0.el7_6
- redhat-virtualization-host-image-update-placeholder< 0:4.2-7.5.el7
Debian2 products
- openvswitch< 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-1
- debian_linuxEOL9.0
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04
Openvswitch1 product
- openvswitch≥ 2.7.0, ≤ 2.7.6
Ubuntu1 product
- openvswitch< 2.5.5-0ubuntu0.16.04.2 | < 2.9.2-0ubuntu0.18.04.3
5 vendors · 10 products
References
16 links- github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cdeX Refsource MISCPatchThird Party Advisory
lists.debian.org/debian-lts-announce/2021/02/msg00032.htmlMailing ListX Refsource MLISTThird Party Advisory
