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

Severity: high (CVSS 8.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-15 · updated 2026-07-24
Weakness: CWE-119

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 and is working on a patch to fix it.

Affected products

Yealink SIP-T46U: 108.87.50.1

References

http://cdn2.v50to.cc/T46U/T46U_beforewifitest_stack_overflow.zip
https://vuldb.com/cve/CVE-2026-12218
https://vuldb.com/submit/834193
https://vuldb.com/vuln/370861
https://vuldb.com/vuln/370861/cti

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