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TOTOLINK A830R, A950RG, A3000RU, and A3100R Buffer Overflow Vulnerability in downloadFile.cgi

Vulnerability

A buffer overflow vulnerability has been identified in TOTOLINK routers A830R (firmware V4.1.2cu.5182_B20201102), A950RG (firmware V4.1.2cu.5161_B20200903), A3000RU (firmware V5.9c.5185_B20201128), and A3100R (firmware V4.1.2cu.5247_B20211129). The vulnerability arises in the downloadFile.cgi file, specifically through the v14 parameter.

Impact

Exploitation of this vulnerability leads to a buffer overflow, which can commonly result in arbitrary code execution or causing the device to crash.

Added: Jun 9, 2025, 7:46 PM
Updated: Jun 9, 2025, 7:46 PM

Vulnerability Rating

Custom Algorithm
spread
2.6
impact
10.0
exploitability
9.1
remediation
0.0
relevance
0.0
threat
6.4
urgency
2.9
incentive
9.2

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.