CVE-2021-22161
Last modified
CVE-2021-22161 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.52% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openwrt | Openwrt | >= 19.07.0, <= 19.07.6 |
References
- https://openwrt.org/advisory/2021-02-02-1Vendor Advisory
- https://openwrt.org/advisory/2021-02-02-1Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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