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CVE Vulnerabilities

CVE-2020-35498

Uncontrolled Resource Consumption

Published: Feb 11, 2021 | Modified: Apr 23, 2025
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
7.8 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-35498
CWEhttps://cwe.mitre.org/data/definitions/400.html

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.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

NameVendorStart VersionEnd Version
OpenvswitchOpenvswitch2.5.0 (including)2.5.12 (excluding)
OpenvswitchOpenvswitch2.6.0 (including)2.6.10 (excluding)
OpenvswitchOpenvswitch2.7.0 (including)2.7.13 (excluding)
OpenvswitchOpenvswitch2.8.0 (including)2.8.11 (excluding)
OpenvswitchOpenvswitch2.9.0 (including)2.9.9 (excluding)
OpenvswitchOpenvswitch2.10.0 (including)2.10.7 (excluding)
OpenvswitchOpenvswitch2.11.0 (including)2.11.6 (excluding)
OpenvswitchOpenvswitch2.12.0 (including)2.12.3 (excluding)
OpenvswitchOpenvswitch2.13.0 (including)2.13.3 (excluding)
OpenvswitchOpenvswitch2.14.0 (including)2.14.2 (excluding)
Fast Datapath for Red Hat Enterprise Linux 7RedHatopenvswitch2.11-0:2.11.3-86.el7fdp*
Fast Datapath for Red Hat Enterprise Linux 7RedHatopenvswitch2.13-0:2.13.0-81.el7fdp*
Fast Datapath for Red Hat Enterprise Linux 7RedHatopenvswitch-0:2.9.9-1.el7fdp*
Fast Datapath for Red Hat Enterprise Linux 8RedHatopenvswitch2.13-0:2.13.0-79.5.el8fdp*
Fast Datapath for Red Hat Enterprise Linux 8RedHatopenvswitch2.11-0:2.11.3-83.el8fdp*
Red Hat OpenStack Platform 13.0 (Queens)RedHatopenvswitch2.11-0:2.11.3-86.el7fdp*
Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUSRedHatopenvswitch-0:2.9.9-1.el7fdp*
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7RedHatopenvswitch2.11-0:2.11.3-86.el7fdp*
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7RedHatovn2.11-0:2.11.1-57.el7fdp*
OpenvswitchUbuntubionic*
OpenvswitchUbuntudevel*
OpenvswitchUbuntuesm-infra/bionic*
OpenvswitchUbuntuesm-infra/focal*
OpenvswitchUbuntuesm-infra/xenial*
OpenvswitchUbuntufocal*
OpenvswitchUbuntugroovy*
OpenvswitchUbuntutrusty*
OpenvswitchUbuntuxenial*

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References

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