CVE-2026-12218
Received Received - Intake
Stack-Based Buffer Overflow in Yealink SIP-T46U

Publication date: 2026-06-15

Last updated on: 2026-06-15

Assigner: VulDB

Description
A vulnerability was detected in Yealink SIP-T46U 108.87.50.1. The affected element is the function StartReportInformation of the file /api/inner/beforewifitest of the component Web FastCGI Service. The manipulation of the argument port results in stack-based buffer overflow. Access to the local network is required for this attack. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Meta Information
Published
2026-06-15
Last Modified
2026-06-15
Generated
2026-06-15
AI Q&A
2026-06-15
EPSS Evaluated
N/A
NVD
CVE-2026-12218
EUVD
EUVD-2026-36691
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
yealink sip-t46u 108.87.50.1
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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-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
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Executive Summary

This vulnerability exists in the Yealink SIP-T46U device, specifically in the StartReportInformation function within the /api/inner/beforewifitest file of the Web FastCGI Service component.

The issue arises from improper handling of the 'port' argument, which leads to a stack-based buffer overflow.

Exploitation requires access to the local network, and the exploit code is publicly available.

The vendor was informed early but did not respond.

Impact Analysis

The vulnerability can lead to a stack-based buffer overflow, which may allow an attacker to execute arbitrary code or cause a denial of service on the affected device.

Since the attack requires local network access, an attacker within the same network could exploit this to compromise the device's confidentiality, integrity, and availability.

The CVSS v3.1 score of 8.0 indicates a high severity impact on confidentiality, integrity, and availability.

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