CVE-2021-40847 Code injection in n/a
Remote attackers can achieve root code execution on NETGEAR routers via a Man-in-the-Middle attack exploiting unsigned, cleartext HTTP updates in the Circle daemon.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-40847?
CVE-2021-40847 is a high-severity code injection vulnerability in Netgear R6700 Firmware, published on 21 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The update process of the Circle Parental Control Service on various NETGEAR routers allows remote attackers to achieve remote code execution as root via a MitM attack. While the parental controls themselves are not enabled by default on the routers, the Circle update daemon, circled, is enabled by default. This daemon connects to Circle and NETGEAR to obtain version information and updates to the circled daemon and its filtering database. However, database updates from NETGEAR are unsigned and downloaded via cleartext HTTP. As such, an attacker with the ability to perform a MitM attack on the device can respond to circled update requests with a crafted, compressed database file, the extraction of which gives the attacker the ability to overwrite executable files with attacker-controlled code. This affects R6400v2 1.0.4.106, R6700 1.0.2.16, R6700v3 1.0.4.106, R6900 1.0.2.16, R6900P 1.3.2.134, R7000 1.0.11.123, R7000P 1.3.2.134, R7850 1.0.5.68, R7900 1.0.4.38, R8000 1.0.4.68, and RS400 1.5.0.68.
Weakness: CWE-319
Which versions are affected by CVE-2021-40847?
It affects 11 products.
Products include Netgear R6400v2 Firmware, Netgear R6700 Firmware, Netgear R6700v3 Firmware, Netgear R6900 Firmware, Netgear R6900p Firmware, Netgear R7000 Firmware and 5 more.
How do I fix CVE-2021-40847?
No fix has been published for CVE-2021-40847 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-40847 being exploited?
There is no known exploitation of CVE-2021-40847 in the wild and no public exploit code.
Other vulnerabilities in Netgear R6700 Firmware
Sources
Also known as GHSA-62q2-fg4c-c2qp.