CVE-2026-7749
Received Received - Intake
Buffer Overflow in Totolink N300RH Firmware via DNS Configuration

Publication date: 2026-05-04

Last updated on: 2026-05-04

Assigner: VulDB

Description
A security vulnerability has been detected in Totolink N300RH 3.2.4-B20220812. This affects the function setWanConfig of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument priDns leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-05-04
Last Modified
2026-05-04
Generated
2026-06-16
AI Q&A
2026-05-04
EPSS Evaluated
2026-06-15
NVD
CVE-2026-7749
EUVD
EUVD-2026-26941
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
totolink n300rh 3.2.4-b20220812
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability exists in the Totolink N300RH device, specifically in version 3.2.4-B20220812. It affects the function setWanConfig within the file /cgi-bin/cstecgi.cgi, which handles POST requests. The issue arises from improper handling of the argument priDns, leading to a buffer overflow. This means that an attacker can remotely send crafted data to overflow the buffer, potentially causing unexpected behavior or allowing further exploitation.

Impact Analysis

The buffer overflow vulnerability can be exploited remotely without user interaction, which may allow an attacker to execute arbitrary code or cause a denial of service on the affected device. This can lead to compromise of the device's functionality, unauthorized access, or disruption of network services.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-7749. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart