CVE-2026-12220
Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpload stack-based overflow
Vexday Risk Score
41Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
CVSS 8.6EPSS 0.4%KEV nãoPoC públicaNuclei —Metasploit —Patch referenciado
Lifecycle
15 Jun 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
A vulnerability has been found in Yealink SIP-T46U 108.86.0.118. This affects the function mod_upgrade.SparePartsUpload of the file /api/upgrade/accupgradebychunk of the component Firmware Chunk Upload handler. Such manipulation of the argument uid leads to stack-based buffer overflow. The attack can only be initiated within the local network. The exploit has been disclosed to the public and may 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
Affected products
Yealink · SIP-T46Upublic PoCs found — 1
cve_referencecdn2.v50to.cc/T46U/T46U_mod_upgrade_SparePartsUpload_stack_overflow.zipunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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