Vulnerability Details : CVE-2021-40847
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.
Vulnerability category: Execute code
Exploit prediction scoring system (EPSS) score for CVE-2021-40847
Probability of exploitation activity in the next 30 days: 0.48%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 75 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-40847
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
---|---|---|---|---|---|
9.3
|
HIGH | AV:N/AC:M/Au:N/C:C/I:C/A:C |
8.6
|
10.0
|
NIST |
8.1
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.2
|
5.9
|
NIST |
CWE ids for CVE-2021-40847
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The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-40847
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https://kb.netgear.com/000064039/Security-Advisory-for-Remote-Code-Execution-on-Some-Routers-PSV-2021-0204
Security Advisory for Remote Code Execution on Some Routers, PSV-2021-0204 | Answer | NETGEAR SupportVendor Advisory
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https://blog.grimm-co.com/2021/09/mama-always-told-me-not-to-trust.html
Mama Always Told Me Not to Trust Strangers without CertificatesExploit;Third Party Advisory
Products affected by CVE-2021-40847
- cpe:2.3:o:netgear:r6700_firmware:1.0.2.16:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:r6900_firmware:1.0.2.16:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:r7000_firmware:1.0.11.123:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:r7900_firmware:1.0.4.38:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:r8000_firmware:1.0.4.68:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:r7000p_firmware:1.3.2.134:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:r6900p_firmware:1.3.2.134:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:r7850_firmware:1.0.5.68:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:rs400_firmware:1.5.0.68:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:r6400v2_firmware:1.0.4.106:*:*:*:*:*:*:*
- cpe:2.3:o:netgear:r6700v3_firmware:1.0.4.106:*:*:*:*:*:*:*