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CVE-2021-34991

Quick assessment

Affected
NETGEAR R6400v2
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netgear NETGEAR R6400v2是美国网件（Netgear）公司的一款路由器。连接两个或多个网络的硬件设备，在网络间起网关的作用。 NETGEAR R6400v2存在缓冲区错误漏洞，该漏洞源于 UPnP 服务默认侦听 TCP 端口 5000。在解析 uuid 请求标头时，该进程在将用户提供的数据复制到固定长度的基于堆栈的缓冲区之前没有正确验证它的长度。攻击者可以利用该漏洞在 root 环境中执行代码。

AI Predicted 9.8 Difficulty: Easy EPSS 5.67% · P93

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-34991

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6400v2 1.0.4.106_10.0.80 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the UPnP service, which listens on TCP port 5000 by default. When parsing the uuid request header, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-14110.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
NETGEAR R6400v2 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netgear NETGEAR R6400v2是美国网件（Netgear）公司的一款路由器。连接两个或多个网络的硬件设备，在网络间起网关的作用。 NETGEAR R6400v2存在缓冲区错误漏洞，该漏洞源于 UPnP 服务默认侦听 TCP 端口 5000。在解析 uuid 请求标头时，该进程在将用户提供的数据复制到固定长度的基于堆栈的缓冲区之前没有正确验证它的长度。攻击者可以利用该漏洞在 root 环境中执行代码。
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
NETGEAR R6400v2 1.0.4.106_10.0.80 -

II. Public POCs for CVE-2021-34991

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III. Intelligence Information for CVE-2021-34991

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Vendor Advisories for CVE-2021-34991 (1)

Other References for CVE-2021-34991 (1)

IV. Related Vulnerabilities

Same vendor: NETGEAR
Same weakness: CWE-121

V. Comments for CVE-2021-34991

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