CVE-2021-22161
OpenWrt IPv6 Routing Loop 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.
INFO
Published Date :
Feb. 7, 2021, 11:15 p.m.
Last Modified :
May 24, 2023, 3:01 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-22161.
| URL | Resource |
|---|---|
| https://openwrt.org/advisory/2021-02-02-1 | Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-22161 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-22161 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CPE Deprecation Remap by [email protected]
May. 24, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:openwrt:openwrt:*:*:*:*:*:*:*:* versions from (including) 19.07.0 from (including) 19.07.6 OR *cpe:2.3:o:openwrt:openwrt:*:*:*:*:*:*:*:* versions from (including) 19.07.0 from (including) 19.07.6 -
Initial Analysis by [email protected]
Feb. 11, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:A/AC:L/Au:N/C:N/I:N/A:P) Added CVSS V3.1 NIST AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://openwrt.org/advisory/2021-02-02-1 No Types Assigned https://openwrt.org/advisory/2021-02-02-1 Vendor Advisory Added CWE NIST CWE-835 Added CPE Configuration OR *cpe:2.3:a:openwrt:openwrt:*:*:*:*:*:*:*:* versions from (including) 19.07.0 up to (including) 19.07.6 -
CVE Modified by [email protected]
Feb. 08, 2021
Action Type Old Value New Value Changed 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. 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.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-22161 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-22161
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} 0.01%
score
0.23157
percentile