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CVE-2026-12221

Yealink SIP-T46U Firmware Chunk Upload upgrade sprintf stack-based overflow

CVSS 8.6 HIGHEPSS 0.4%CWE-119CWE-121
Vexday Risk Score
41Atención
Decisión SSVC (CISA)
Attend
PoC disponible → seguir de cerca
CVSS 8.6EPSS 0.4%KEV nãoPoC públicaNuclei Metasploit Patch referenciado
Ciclo de vida
15 jun 2026Publicada en NVD
Recomendación: Planificar corrección próxima — ya existe PoC pública.
A vulnerability was found in Yealink SIP-T46U 108.86.0.118. This impacts the function sprintf of the file /api/upgrade/upgrade of the component Firmware Chunk Upload Handler. Performing a manipulation of the argument uid/start_offset results in stack-based buffer overflow. The attack needs to be approached within the local network. The exploit has been made public and could be used. The vendor was contacted early about this disclosure and is working on a patch to fix it.
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
Productos afectados
Yealink · SIP-T46U
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