CVE-2021-34991
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I. Basic Information for CVE-2021-34991
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
栈缓冲区溢出
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2021-34991
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- https://www.zerodayinitiative.com/advisories/ZDI-21-1303/x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-34991
IV. Related Vulnerabilities
Same vendor: NETGEAR
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NETGEAR PR2000 安全漏洞 - CVE-2026-0404
Insufficient input validation in NETGEAR Orbi routers - CVE-2026-0408
Path traversal vulnerability in Netgear WiFi Range Extenders - CVE-2026-0407
Authentication bypass in NETGEAR WiFi Range Extenders via ne - CVE-2026-0406
Insufficient input validation in NETGEAR Nighthawk router XR
Same weakness: CWE-121
- CVE-2026-8258
Squirrel sqstdstring.cpp validate_format stack-based overflo - CVE-2026-8234
EFM ipTIME A8004T WifiBasicSet formWifiBasicSet stack-based - CVE-2026-6665
PgBouncer buffer overflow in SCRAM - CVE-2026-41509
Integer underflow in crypto_sign_open() leads to buffer over - CVE-2026-8138
Tenda CX12L SetPptpServerCfg” formSetPPTPServer stack-based
V. Comments for CVE-2021-34991
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