CVE-2021-40847

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2021-40847
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-09-21 18:15:00 UTC
Updated2021-10-07 19:23:00 UTC
DescriptionThe 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.

Risk And Classification

Problem Types: CWE-319

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Netgear R6400v2 - All All All
Operating System Netgear R6400v2 Firmware 1.0.4.106 All All All
Hardware Netgear R6700 - All All All
Hardware Netgear R6700v3 - All All All
Operating System Netgear R6700v3 Firmware 1.0.4.106 All All All
Operating System Netgear R6700 Firmware 1.0.2.16 All All All
Hardware Netgear R6900 - All All All
Hardware Netgear R6900p - All All All
Operating System Netgear R6900p Firmware 1.3.2.134 All All All
Operating System Netgear R6900 Firmware 1.0.2.16 All All All
Hardware Netgear R7000 - All All All
Hardware Netgear R7000p - All All All
Operating System Netgear R7000p Firmware 1.3.2.134 All All All
Operating System Netgear R7000 Firmware 1.0.11.123 All All All
Hardware Netgear R7850 - All All All
Operating System Netgear R7850 Firmware 1.0.5.68 All All All
Hardware Netgear R7900 - All All All
Operating System Netgear R7900 Firmware 1.0.4.38 All All All
Hardware Netgear R8000 - All All All
Operating System Netgear R8000 Firmware 1.0.4.68 All All All
Hardware Netgear Rs400 - All All All
Operating System Netgear Rs400 Firmware 1.5.0.68 All All All

References

ReferenceSourceLinkTags
Mama Always Told Me Not to Trust Strangers without Certificates MISC blog.grimm-co.com
Security Advisory for Remote Code Execution on Some Routers, PSV-2021-0204 | Answer | NETGEAR Support MISC kb.netgear.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

CVE.report and Source URL Uptime Status status.cve.report