CVE-2020-35498

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

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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.

Se encontró una vulnerabilidad en openvswitch. Una limitación en la implementación del análisis de paquetes del espacio de usuario puede permitir a un usuario malicioso envíe un paquete especialmente diseñado, lo que hace que el megaflujo resultante en el kernel sea demasiado amplio, causando potencialmente una denegación de servicio. La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema

Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the container images for Red Hat OpenShift Container Platform 4.7.4.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2020-12-17 CVE Reserved
2021-02-11 CVE Published
2021-02-12 First Exploit
2025-04-23 CVE Updated
2025-05-05 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (8)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html	Mailing List

URL	Date	SRC
https://github.com/freddierice/cve-2020-35498-flag	2021-02-12

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1908845	2021-06-16
https://www.openwall.com/lists/oss-security/2021/02/10/4	2023-11-26

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7BOEDJZHPR	2023-11-26
https://security.gentoo.org/glsa/202311-16	2023-11-26
https://www.debian.org/security/2021/dsa-4852	2023-11-26
https://access.redhat.com/security/cve/CVE-2020-35498	2021-06-16

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.5.0 < 2.5.12 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.5.0 < 2.5.12"		-		Affected
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.6.0 < 2.6.10 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.6.0 < 2.6.10"		-		Affected
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.7.0 < 2.7.13 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.7.0 < 2.7.13"		-		Affected
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.8.0 < 2.8.11 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.8.0 < 2.8.11"		-		Affected
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.9.0 < 2.9.9 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.9.0 < 2.9.9"		-		Affected
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.10.0 < 2.10.7 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.10.0 < 2.10.7"		-		Affected
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.11.0 < 2.11.6 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.11.0 < 2.11.6"		-		Affected
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.12.0 < 2.12.3 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.12.0 < 2.12.3"		-		Affected
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.13.0 < 2.13.3 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.13.0 < 2.13.3"		-		Affected
Openvswitch Search vendor "Openvswitch"		Openvswitch Search vendor "Openvswitch" for product "Openvswitch"				>= 2.14.0 < 2.14.2 Search vendor "Openvswitch" for product "Openvswitch" and version " >= 2.14.0 < 2.14.2"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected