CVE-2021-45529 : Exploit Details and Defense Strategies

Certain NETGEAR devices are affected by a buffer overflow by an authenticated user. This affects multiple router models.

Understanding CVE-2021-45529

What is CVE-2021-45529?

Certain NETGEAR routers are vulnerable to a buffer overflow when accessed by an authenticated user, potentially leading to unauthorized access or denial of service.

The Impact of CVE-2021-45529

The vulnerability has a CVSS base score of 7.3, indicating a high severity issue with a significant impact on availability.

Technical Details of CVE-2021-45529

Vulnerability Description

A buffer overflow vulnerability exists in specific versions of NETGEAR routers, allowing an authenticated user to execute arbitrary code or crash the device.

Affected Systems and Versions

CBR40 before 2.3.5.12
D7000v2 before 1.0.0.66
D8500 before 1.0.3.58
R6400 before 1.0.1.70
R7000 before 1.0.11.126
R6900P before 1.3.2.124
R7000P before 1.3.2.124
R7900 before 1.0.4.30
R8000 before 1.0.4.52
WNR3500Lv2 before 1.2.0.62

Exploitation Mechanism

The vulnerability requires a high level of privileges to exploit and can be triggered locally, making it easier for authenticated attackers to take advantage.

Mitigation and Prevention

Immediate Steps to Take

Update the affected NETGEAR routers to the latest firmware versions.
Monitor network traffic for any suspicious activity.
Limit access to the routers to trusted users only.

Long-Term Security Practices

Regularly review security advisories from NETGEAR and other sources.
Implement network segmentation to isolate critical devices.

Patching and Updates

NETGEAR has released security updates addressing this vulnerability. Ensure timely application of patches to all affected devices.