Many Netgear Router Models Contain Serious RCE Security

This guide provides a clear, practical overview of many netgear router models contain serious RCE security, with useful context, important details, and straightforward takeaways for everyday readers.

This vulnerability is assigned code CVE-2021-40847 and affects the following router models:

R6400v2 (patched with firmware version 1.0.4.120)
R6700 (patched with firmware version 1.0.2.26)
R6700v3 (patched with firmware version 1.0.4.120)
R6900 (fixed with firmwaren 1.0.2.26)
R6900P (patched with firmware version 3.3.142_HOTFIX)
R7000 (patched with firmware version 1.0.11.128)
R7000P (patched with firmware version 1.3.3.142_HOTFIX)
R7850 (patched with firmware version 1.0.5.76)
R7900 (patched with firmware version 1.0.4.46)
R8000 (patched with firmware version 1.0.4.76)
RS400 (patched with firmware version 1.5.1.80)

According to GRIMM security researcher Adam Nichols, the vulnerability resides in Circle, a third-party component in the firmware. It provides parental control features in Netgear devices.

Many Netgear Router Models Contain Serious RCE Security

More dangerously, the problem is related to Circle's update mechanism (deamon), which is enabled by default even if the router has not been set up to limit access time. This leads to hackers being able to execute RCE as root through Man-in-the-Middle (MitM) attack.

Update daemon connects Circle and Netgear together to find and load updates to the filter database. However, neither side is certified and downloads using the HTTP protocol. Therefore, hackers can break into the connection to install malicious files.

To ensure safety, Netgear recommends that users immediately update to the latest firmware versions.

Key Takeaways

Use the information above as a practical reference for many netgear router models contain serious RCE security. Review each step carefully, confirm any requirements, and choose the option that best fits your situation.

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