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Fencer Intel
high 7.5

CVE-2020-35498 json

A vulnerability was found in openvswitch.

published 5y ago modified 4mo ago also EUVD-2020-23167

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
8.0%
EPSS 8.0% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.

Patch / fix

  • openvswitch openvswitch 2.5.12, 2.6.10, 2.7.13, 2.8.11, 2.9.9, 2.10.7, 2.11.6, 2.12.3, 2.13.3, 2.14.2
  • openvswitch Debian 14, Debian 13, Debian 12 2.15.0~git20210104.def6eb1ea+dfsg1-5

debian advisories DEBIAN-CVE-2020-35498

  • openvswitch Ubuntu 16.04 LTS 2.5.9-0ubuntu0.16.04.3
  • openvswitch Ubuntu 18.04 LTS 2.9.8-0ubuntu0.18.04.2
  • openvswitch Ubuntu 20.04 LTS 2.13.1-0ubuntu0.20.04.4

ubuntu advisories UBUNTU-CVE-2020-35498

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openvswitch2.11 RHEL 7, openstack 13 2.11.3-86.el7fdp
  • openvswitch2.11-test RHEL 7, openstack 13 2.11.3-86.el7fdp
  • python-openvswitch2.11 RHEL 7, openstack 13 2.11.3-86.el7fdp
  • openvswitch RHEL 7 2.9.9-1.el7fdp
  • openvswitch-test RHEL 7 2.9.9-1.el7fdp
  • python-openvswitch RHEL 7 2.9.9-1.el7fdp
  • openvswitch2.13 RHEL 7 2.13.0-81.el7fdp
  • openvswitch2.13-test RHEL 7 2.13.0-81.el7fdp

red hat advisories RHSA-2021:2456RHSA-2021:2077RHSA-2021:0835RHSA-2021:0837RHSA-2021:0834RHSA-2021:1050

  • openvswitch SLES for SAP 12 SP5, SLES 12 SP5 2.11.5-3.9.1
  • openvswitch SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 2.8.10-4.26.1
  • openvswitch SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 2.5.11-25.29.1
  • openvswitch-dpdk SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 2.5.11-25.29.1
  • openvswitch SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 2.7.12-3.39.1
  • openvswitch SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.11.5-6.33.3
  • openvswitch SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +7 more 2.11.5-3.15.3
  • openvswitch SLE Module for Server Applications 15 SP2, SLE Module for Package Hub 15 SP2 2.13.2-9.14.1

suse advisories SUSE-SU-2022:3384-1SUSE-SU-2021:0479-1SUSE-SU-2021:0451-1SUSE-SU-2021:0446-1SUSE-SU-2021:0440-1SUSE-SU-2021:0439-1

  • openvswitch openSUSE Leap 15.2 2.13.2-lp152.3.12.1

opensuse advisories openSUSE-SU-2021:0283-1

  • openvswitch Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 2.12.3-r0

alpine advisories ALPINE-CVE-2020-35498

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openvswitch Arch Linux 2.14.2-1

arch linux advisories AVG-1564

Is CVE-2020-35498 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-35498 updated cvss 7.5

openvswitch: limitation in the OVS packet parsing in userspace leads to DoS

  • Red Hat Fast Datapath for RHEL 7 openvswitch2.10, openvswitch2.12, openvswitch2.10-test, openvswitch2.12-test, python-openvswitch2.10, python-openvswitch2.12, +4 more Red Hat Fast Datapath for RHEL 8 openvswitch2.12, openvswitch2.12-test, python3-openvswitch2.12, network-scripts-openvswitch2.12
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openvswitch2.13, openvswitch2.13-test, python3-openvswitch2.13, network-scripts-openvswitch2.13
    affected: no fix available
  • Red Hat OpenStack Platform 10 (Newton) openvswitch, openvswitch-test, python-openvswitch, openvswitch-ovn-host, openvswitch-ovn-vtep, openvswitch-ovn-common, +2 more Red Hat OpenStack Platform 13 (Queens) openvswitch, openvswitch-test, python-openvswitch, openvswitch-ovn-host, openvswitch-ovn-vtep, openvswitch-ovn-common, +1 more
    affected: no fix planned “Out of support scope”
  • Red Hat Fast Datapath for Red Hat Enterprise Linux 7 openvswitch 2.9.9-1.el7fdp, openvswitch-test 2.9.9-1.el7fdp, openvswitch2.11 2.11.3-86.el7fdp, openvswitch2.13 2.13.0-81.el7fdp, python-openvswitch 2.9.9-1.el7fdp, openvswitch2.11-test 2.11.3-86.el7fdp, +4 more
    fixed: vendor fix RHSA-2021:2077
  • Red Hat Fast Datapath for Red Hat Enterprise Linux 8 openvswitch2.11 2.11.3-83.el8fdp, openvswitch2.13 2.13.0-79.5.el8fdp, openvswitch2.11-test 2.11.3-83.el8fdp, openvswitch2.13-test 2.13.0-79.5.el8fdp, openvswitch2.13-ipsec 2.13.0-79.5.el8fdp, python3-openvswitch2.11 2.11.3-83.el8fdp, +3 more
    fixed: vendor fix RHSA-2021:0837
  • Red Hat OpenStack Platform 13.0 openvswitch2.11 2.11.3-86.el7fdp, openvswitch2.11-test 2.11.3-86.el7fdp, python-openvswitch2.11 2.11.3-86.el7fdp
    fixed: vendor fix RHSA-2021:2456
  • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts ovn2.11 2.11.1-57.el7fdp, ovn2.11-host 2.11.1-57.el7fdp, ovn2.11-vtep 2.11.1-57.el7fdp, openvswitch2.11 2.11.3-86.el7fdp, python-openvswitch2.11 2.11.3-86.el7fdp
    fixed: vendor fix RHSA-2021:1050
  • Red Hat Virtualization 4.2 Management Agent for RHEL 7.6 EUS Hosts openvswitch 2.9.9-1.el7fdp, python-openvswitch 2.9.9-1.el7fdp
    fixed: vendor fix RHSA-2021:2077
show 1 more
  • Red Hat OpenShift Container Platform 4 openvswitch2.15, openvswitch2.15-test, openvswitch2.15-ipsec, python3-openvswitch2.15, network-scripts-openvswitch2.15
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

8.03% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • n/a openvswitch

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.