CVE-2021-22161

07.02.2021, 23:15

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.

Infinite Loop

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	6.5 MEDIUM	ADJACENT_NETWORK	LOW	NONE	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
mitre	CNA	---				---
CVE	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 29%

Vendor	Product	Version
openwrt	openwrt	19.07.0 ≤ 𝑥 ≤ 19.07.6

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
The program contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

References

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