CVE-2026-1156
Unknown Unknown - Not Provided

Remote Buffer Overflow in Totolink LR350 WiFi Configuration

Publication date: 2026-01-19

Last updated on: 2026-01-19

Assigner: VulDB

Description
A vulnerability was determined in Totolink LR350 9.3.5u.6369_B20220309. Affected by this issue is the function setWiFiBasicCfg of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument ssid causes buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.

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Meta Information

Published
2026-01-19
Last Modified
2026-01-19
Generated
2026-07-06
AI Q&A
2026-01-19
EPSS Evaluated
2026-07-05
NVD
CVE-2026-1156
EUVD
EUVD-2026-3222

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
totolink lr350 9.3.5u.6369_b20220309

Helpful Resources

Exploitability

CWE
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KEV
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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

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Executive Summary

CVE-2026-1156 is a buffer overflow vulnerability in the Totolink LR350 router firmware version 9.3.5u.6369_B20220309. It occurs in the function setWiFiBasicCfg within the CGI script /cgi-bin/cstecgi.cgi. The vulnerability arises because the "ssid" parameter is processed without proper bounds checking, allowing an attacker to send a specially crafted SSID that overflows a buffer on the stack. This can be triggered remotely without authentication. [1, 2]

Impact Analysis

This vulnerability can impact you by compromising the confidentiality, integrity, and availability of the affected Totolink LR350 router. An attacker can remotely exploit the buffer overflow to potentially execute arbitrary code, cause a denial of service, or take control of the device. The attack is easy to execute, and a proof-of-concept exploit is publicly available, making the risk significant. [2]

Detection Guidance

This vulnerability can be detected by monitoring or testing the /cgi-bin/cstecgi.cgi endpoint for the setWiFiBasicCfg command with a crafted ssid parameter that causes a buffer overflow. Since the vulnerability is triggered remotely via this CGI script, detection could involve sending test requests with oversized ssid values to observe abnormal behavior or crashes. Specific commands are not provided in the resources, but using tools like curl or custom scripts to send HTTP POST requests to /cgi-bin/cstecgi.cgi with manipulated ssid parameters could help detect the vulnerability. [1, 2]

Mitigation Strategies

Immediate mitigation steps include replacing the affected Totolink LR350 router firmware version 9.3.5u.6369_B20220309 with a non-vulnerable version or a different device, as no known countermeasures or patches are currently available. Avoid exposing the device's management interface to untrusted networks and restrict remote access to reduce exploitation risk. [2]

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