Description
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.
References (1)
Core 1
Core References
Vendor Advisory x_refsource_confirm
https://openwrt.org/advisory/2021-02-02-1
Scores
CVSS v3
6.5
EPSS
0.0024
EPSS Percentile
47.6%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-835
Status
published
Products (1)
openwrt/openwrt
19.07.0 - 19.07.6
Published
Feb 07, 2021
Tracked Since
Feb 18, 2026