CVE-2021-22161: Medium severity open edx vulnerability
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.
Affected Software
Event History
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.