Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openwrt | Openwrt | >= 19.07.0, <= 19.07.6 |
Related Weaknesses (CWE)
References
- https://openwrt.org/advisory/2021-02-02-1Vendor Advisory
- https://openwrt.org/advisory/2021-02-02-1Vendor Advisory
FAQ
What is CVE-2021-22161?
CVE-2021-22161 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 lin...
How severe is CVE-2021-22161?
CVE-2021-22161 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-22161?
Check the references section above for vendor advisories and patch information. Affected products include: Openwrt Openwrt.