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CVE-2021-27256

Quick assessment

Affected
NETGEAR R7800
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.

Netgear NETGEAR R7800是美国网件（Netgear）公司的一款无线路由器。 NETGEAR R7800 存在操作系统命令注入漏洞，该漏洞源于使用用户提供的字符串执行系统调用之前，没有对它进行适当的验证。攻击者可利用该漏洞在root上下文中执行代码。

AI Predicted 9.8 Difficulty: Easy EPSS 0.96% · P60
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I. Basic Information for CVE-2021-27256

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 R7800 firmware version 1.0.2.76. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rc_service parameter provided to apply_save.cgi. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12355.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Netgear NETGEAR R7800 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netgear NETGEAR R7800是美国网件（Netgear）公司的一款无线路由器。 NETGEAR R7800 存在操作系统命令注入漏洞，该漏洞源于使用用户提供的字符串执行系统调用之前，没有对它进行适当的验证。攻击者可利用该漏洞在root上下文中执行代码。
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 R7800 firmware version 1.0.2.76 -

II. Public POCs for CVE-2021-27256

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III. Intelligence Information for CVE-2021-27256

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Vendor Advisories for CVE-2021-27256 (1)

Other References for CVE-2021-27256 (1)

Same Patch Batch · NETGEAR · 2021-03-05 · 4 CVEs total

CVE-2021-27254 Netgear NETGEAR 信任管理问题漏洞
CVE-2021-27255 Netgear NETGEAR R7800 访问控制错误漏洞
CVE-2021-27257 Netgear NETGEAR R7800 信任管理问题漏洞

IV. Related Vulnerabilities

Same product: R7800
Same vendor: NETGEAR
Same weakness: CWE-78

V. Comments for CVE-2021-27256

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