What is the vulnerability ID for this OpenWrt vulnerability?

The vulnerability ID for this OpenWrt vulnerability is CVE-2021-22161.

What is the severity level of CVE-2021-22161?

The severity level of CVE-2021-22161 is medium with a CVSS score of 6.5.

How does CVE-2021-22161 affect OpenWrt 19.07.x?

CVE-2021-22161 affects OpenWrt 19.07.x by causing a routing loop that generates excessive network traffic.

How can I fix the CVE-2021-22161 vulnerability in my OpenWrt 19.07.x installation?

To fix the CVE-2021-22161 vulnerability in OpenWrt 19.07.x, upgrade to version 19.07.7, which includes a patch for this issue.

Vulnerability/
CVE-2021-22161

medium

6.5

CWE

835

7/2/2021

3/8/2024

CVE-2021-22161

Q: How can the routing loop in CVE-2021-22161 be triggered?

The routing loop in CVE-2021-22161 can be triggered when a link prefix route points to a point-to-point link and a destination IPv6 address belongs to the prefix.

First published: Sun Feb 07 2021(Updated: )

In OpenWrt 19.07.x before 19.07.7, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set. This affects the netifd and odhcp6c packages.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
OpenWrt OpenWrt	>=19.07.0<=19.07.6

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Reference Links

https://openwrt.org/advisory/2021-02-02-1

Frequently Asked Questions

What is the vulnerability ID for this OpenWrt vulnerability?
The vulnerability ID for this OpenWrt vulnerability is CVE-2021-22161.
What is the severity level of CVE-2021-22161?
The severity level of CVE-2021-22161 is medium with a CVSS score of 6.5.
How does CVE-2021-22161 affect OpenWrt 19.07.x?
CVE-2021-22161 affects OpenWrt 19.07.x by causing a routing loop that generates excessive network traffic.
How can the routing loop in CVE-2021-22161 be triggered?
The routing loop in CVE-2021-22161 can be triggered when a link prefix route points to a point-to-point link and a destination IPv6 address belongs to the prefix.
How can I fix the CVE-2021-22161 vulnerability in my OpenWrt 19.07.x installation?
To fix the CVE-2021-22161 vulnerability in OpenWrt 19.07.x, upgrade to version 19.07.7, which includes a patch for this issue.

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