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CVE-2021-22161

Quick assessment

Affected
n/a n/a
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenWrt是一套针对嵌入式设备的Linux操作系统。 OpenWrt 19.07.x before 19.07.7 存在安全漏洞，该漏洞源于当使用IPv6时，可能会产生一个路由环路，在受影响的设备和其上游ISP的路由器之间产生过多的网络流量。

AI Predicted 7.5 Difficulty: Easy EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification
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I. Basic Information for CVE-2021-22161

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
OpenWrt 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenWrt是一套针对嵌入式设备的Linux操作系统。 OpenWrt 19.07.x before 19.07.7 存在安全漏洞，该漏洞源于当使用IPv6时，可能会产生一个路由环路，在受影响的设备和其上游ISP的路由器之间产生过多的网络流量。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- n/a n/a -

II. Public POCs for CVE-2021-22161

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III. Intelligence Information for CVE-2021-22161

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Other References for CVE-2021-22161 (1)

Same Patch Batch · n/a · 2021-02-07 · 6 CVEs total

CVE-2021-26754 WordPress SQL注入漏洞
CVE-2021-26843 sthttpd 缓冲区错误漏洞
CVE-2020-36243 OpenEMR 操作系统命令注入漏洞
CVE-2020-36242 python-cryptography 输入验证错误漏洞
CVE-2021-3122 NCR Command Center Agent 操作系统命令注入漏洞

IV. Related Vulnerabilities

Same product: n/a
Same vendor: n/a

V. Comments for CVE-2021-22161

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