CVE-2021-40847

Katalog CVE

CVSS 8.1 · High EPSS 10,0%

Kerentanan Cleartext Transmission of Sensitive Information pada netgear r6400v2 firmware, netgear r6700 firmware +9 lainnya. Skor CVSS 3.1 8.1 (High) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

21 September 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

8.1 (High), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-319: Cleartext Transmission of Sensitive Information

EPSS (30 hari)

10,0% peluang dieksploitasi; lebih tinggi dari 95,5% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

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