CVE-2020-35498

Name: CVE-2020-35498
Creator: NVD / NIST
Published: 2021-02-11T18:15:15.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 8.03%

Last modified Jun 17, 2026

CVE-2020-35498 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 8.03% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

8.03%

94.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Openvswitch	Openvswitch	>= 2.5.0, < 2.5.12
Openvswitch	Openvswitch	>= 2.6.0, < 2.6.10
Openvswitch	Openvswitch	>= 2.7.0, < 2.7.13
Openvswitch	Openvswitch	>= 2.8.0, < 2.8.11
Openvswitch	Openvswitch	>= 2.9.0, < 2.9.9
Openvswitch	Openvswitch	>= 2.10.0, < 2.10.7
Openvswitch	Openvswitch	>= 2.11.0, < 2.11.6
Openvswitch	Openvswitch	>= 2.12.0, < 2.12.3
Openvswitch	Openvswitch	>= 2.13.0, < 2.13.3
Openvswitch	Openvswitch	>= 2.14.0, < 2.14.2
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Fedoraproject	Fedora	33

References

https://bugzilla.redhat.com/show_bug.cgi?id=1908845Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7BOEDJZHPR/
https://security.gentoo.org/glsa/202311-16
https://www.debian.org/security/2021/dsa-4852Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/02/10/4Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1908845Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7BOEDJZHPR/
https://security.gentoo.org/glsa/202311-16
https://www.debian.org/security/2021/dsa-4852Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/02/10/4Mailing List, Patch, Third Party Advisory

Timeline

Published: Feb 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35498?

How severe is CVE-2020-35498?

CVE-2020-35498 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 8.03% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35498?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-35498?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST