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TI-2020-18020 Aliases CVE-2020-35498GHSA-9978-p96m-85pj

Uncontrolled resource consumption in openvswitch

Priority MEDIUM 50CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 5 fixed, 5 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-400.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.08026 94th percentileScored 2026-11-07
Fix Partial Red Hat: 7 advisoriesRed Hat: 5 fixed, 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—openvswitchopenvswitch 2.5.12, openvswitch 2.6.10, openvswitch 2.7.13, openvswitch 2.8.11, openvswitch 2.9.9, openvswitch 2.10.7, openvswitch 2.11.6, openvswitch 2.12.3, openvswitch 2.13.3, openvswitch 2.14.2—No fix listedCNA
  • openvswitch Vendor— Affected openvswitch 2.5.12, openvswitch 2.6.10, openvswitch 2.7.13, openvswitch 2.8.11, openvswitch 2.9.9, openvswitch 2.10.7, openvswitch 2.11.6, openvswitch 2.12.3, openvswitch 2.13.3, openvswitch 2.14.2 Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*2.5.0 to before 2.5.12; 2.6.0 to before 2.6.10; 2.7.0 to before 2.7.13; 2.8.0 to before 2.8.11; 2.9.0 to before 2.9.9; 2.10.0 to before 2.10.7; 2.11.0 to before 2.11.6; 2.12.0 to before 2.12.3; 2.13.0 to before 2.13.3; 2.14.0 to before 2.14.2VulnerableOpenvswitch
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
  • cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:* Versions 2.5.0 to before 2.5.12; 2.6.0 to before 2.6.10; 2.7.0 to before 2.7.13; 2.8.0 to before 2.8.11; 2.9.0 to before 2.9.9; 2.10.0 to before 2.10.7; 2.11.0 to before 2.11.6; 2.12.0 to before 2.12.3; 2.13.0 to before 2.13.3; 2.14.0 to before 2.14.2 Vulnerable ·Openvswitch
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject

Remediation

Red Hat 7 advisories

  • RHSA-2021:2456 Released 2021-06-16 · Red Hat rating Important
    Red Hat OpenStack Platform 13.0 (openvswitch2.11) security update
    • Red Hat OpenStack Platform 13.0 openvswitch2.11-2.11.3-86.el7fdp, openvswitch2.11-devel-2.11.3-86.el7fdp, openvswitch2.11-test-2.11.3-86.el7fdp +1
  • RHSA-2021:2077 Released 2021-05-20 · Red Hat rating Important
    openvswitch security update
    • Fast Datapath for Red Hat Enterprise Linux 7 openvswitch-2.9.9-1.el7fdp, openvswitch-devel-2.9.9-1.el7fdp, openvswitch-test-2.9.9-1.el7fdp +1
    • Red Hat Virtualization 4.2 Management Agent for RHEL 7.6 EUS Hosts openvswitch-2.9.9-1.el7fdp, openvswitch-devel-2.9.9-1.el7fdp, python-openvswitch-2.9.9-1.el7fdp
  • RHSA-2021:1050 Released 2021-03-31 · Red Hat rating Moderate
    openvswitch2.11 security update
    • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts openvswitch2.11-2.11.3-86.el7fdp, openvswitch2.11-devel-2.11.3-86.el7fdp, ovn2.11-2.11.1-57.el7fdp +3
Show 4 more Red Hat advisories
  • RHSA-2021:0834 Released 2021-03-15 · Red Hat rating Moderate
    openvswitch2.11 security update
    • Fast Datapath for Red Hat Enterprise Linux 7 openvswitch2.11-2.11.3-86.el7fdp, openvswitch2.11-devel-2.11.3-86.el7fdp, openvswitch2.11-test-2.11.3-86.el7fdp +1
  • RHSA-2021:0835 Released 2021-03-15 · Red Hat rating Moderate
    openvswitch2.13 security update
    • Fast Datapath for Red Hat Enterprise Linux 7 openvswitch2.13-2.13.0-81.el7fdp, openvswitch2.13-devel-2.13.0-81.el7fdp, openvswitch2.13-ipsec-2.13.0-81.el7fdp +2
  • RHSA-2021:0837 Released 2021-03-15 · Red Hat rating Moderate
    openvswitch2.11 security update
    • Fast Datapath for Red Hat Enterprise Linux 8 network-scripts-openvswitch2.11-2.11.3-83.el8fdp, openvswitch2.11-2.11.3-83.el8fdp, openvswitch2.11-devel-2.11.3-83.el8fdp +2
  • RHSA-2021:0497 Released 2021-02-11 · Red Hat rating Moderate
    openvswitch2.13 security and bug fix update
    • Fast Datapath for Red Hat Enterprise Linux 8 network-scripts-openvswitch2.13-2.13.0-79.5.el8fdp, openvswitch2.13-2.13.0-79.5.el8fdp, openvswitch2.13-devel-2.13.0-79.5.el8fdp +3

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Fast Datapath for RHEL 7AffectedNo fix planned: Out of support scope
Fast Datapath for RHEL 8AffectedNo fix planned: Out of support scope
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenStack Platform 10 (Newton)AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 13 (Queens)AffectedNo fix planned: Out of support scope
Fast Datapath for Red Hat Enterprise Linux 7Fixed RHSA-2021:0834, RHSA-2021:0835, RHSA-2021:2077
Fast Datapath for Red Hat Enterprise Linux 8Fixed RHSA-2021:0497, RHSA-2021:0837
Red Hat OpenStack Platform 13.0Fixed RHSA-2021:2456
Red Hat Virtualization 4 Management Agent for RHEL 7 HostsFixed RHSA-2021:1050
Red Hat Virtualization 4.2 Management Agent for RHEL 7.6 EUS HostsFixed RHSA-2021:2077
Not affected: 1 product
  • Red Hat OpenShift Container Platform 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-35498
  2. 2026-10-03 Alias added: GHSA-9978-p96m-85pj

References

Patch 2

Advisory 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences