CVE-2026-12218 HIGH

CVE-2026-12218: Yealink SIP-T46U Web FastCGI Service beforewifitest StartReportInformation stack-based overflow

Vendor Yealink
Product SIP-T46U
Weakness CWE-121
Published June 15, 2026
Last update June 15, 2026

CVSS base score

8.6/10
Attack vector Adjacent
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 15, 2026 CVE published
June 15, 2026 Record updated