CVE-2019-20737

Vulnerability

A stack-based buffer overflow vulnerability exists in the pre-authentication code of multiple NETGEAR routers, gateways, and extenders. Affected models include D6220 before 1.0.0.44, D6400 before 1.0.0.78, D7000v2 before 1.0.0.51, D8500 before 1.0.3.42, DGN2200v4 before 1.0.0.106, DGND2200Bv4 before 1.0.0.106, EX3700 before 1.0.0.70, EX3800 before 1.0.0.70, EX6000 before 1.0.0.30, EX6100 before 1.0.2.24, EX6120 before 1.0.0.40, EX6130 before 1.0.0.22, EX6150v1 before 1.0.0.42, EX6200 before 1.0.3.88, EX7000 before 1.0.0.66, R6400 before 1.0.1.42, R6700 before 1.0.1.46, R6700v3 before 1.0.2.52, R6900 before 1.0.1.46, R7000 before 1.0.9.28, R7900P before 1.3.0.10, R8000P before 1.3.0.10, R8300 before 1.0.2.122, R8500 before 1.0.2.122, WN2500RPv2 before 1.0.1.54, WNDR3400v3 before 1.0.1.24, and WNR3500Lv2 before 1.2.0.54. An unauthenticated attacker can trigger the overflow [1].

Exploitation

An unauthenticated attacker on the local network can send a specially crafted request to the affected device's web interface or other exposed services, causing a stack buffer overflow. No authentication or user interaction is required [1].

Impact

Successful exploitation could lead to denial of service or arbitrary code execution with root privileges, fully compromising the device's confidentiality, integrity, and availability [1].

Mitigation

NETGEAR has released firmware updates for all affected models. Users should upgrade to the fixed versions listed in the advisory [1]. No workarounds are available; outdated devices should be replaced if firmware updates are no longer provided.