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Vulnerability record · CVE-2020-35498 · published 11 February 2021

CVE-2020-35498: Openvswitch uncontrolled resource consumption vulnerability

Openvswitch · Openvswitch

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.

7.5 CVSS 3.1 High EPSS 8.0% · top 5.4% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score, v2 7.8
8.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1908845 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7
https://security.gentoo.org/glsa/202311-16
https://www.debian.org/security/2021/dsa-4852 Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/02/10/4 Mailing ListPatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1908845 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7
https://security.gentoo.org/glsa/202311-16
https://www.debian.org/security/2021/dsa-4852 Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/02/10/4 Mailing ListPatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-35498), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.