Remote code execution in NETGEAR devices



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-40847
CWE-ID CWE-94
Exploitation vector Network
Public exploit N/A
Vulnerable software
 R6400v2
Hardware solutions / Routers for home users

R6700
Hardware solutions / Routers for home users

R6900
Hardware solutions / Routers for home users

R6900P
Hardware solutions / Routers for home users

R7000
Hardware solutions / Routers for home users

R7000P
Hardware solutions / Routers for home users

R7850
Hardware solutions / Routers for home users

R7900
Hardware solutions / Routers for home users

R8000
Hardware solutions / Routers for home users

RS400
Hardware solutions / Routers for home users

R6700v3
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor NETGEAR

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Code Injection

EUVDB-ID: #VU56818

Risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-40847

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in the circled update daemon. A remote attacker can execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

R6400v2: before 1.0.4.120

R6700: before 1.0.2.26

R6700v3: before 1.0.4.120

R6900: before 1.0.2.26

R6900P: before 3.3.142_HOTFIX

R7000: before 1.0.11.128

R7000P: before 1.3.3.142_HOTFIX

R7850: before 1.0.5.76

R7900: before 1.0.4.46

R8000: before 1.0.4.76

RS400: before 1.5.1.80

CPE2.3 External links

https://blog.grimm-co.com/2021/09/mama-always-told-me-not-to-trust.html
https://kb.netgear.com/000064039/Security-Advisory-for-Remote-Code-Execution-on-Some-Routers-PSV-2021-0204


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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