CVE-2026-12221

8.0 HIGH

A vulnerability was found in Yealink SIP-T46U 108.86.0.118

Published: 2026-06-15 · Last updated: 2026-06-15

Severity and scoring

CVSS: 8.0 HIGH
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-119, CWE-121

Description

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 but did not respond in any way.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-12221
[Other]http://cdn2.v50to.cc/T46U/T46U_mod_upgrade_Upgrade_chunk_stack_overflow.zip
[Other]https://vuldb.com/cve/CVE-2026-12221
[Other]https://vuldb.com/submit/834207
[Other]https://vuldb.com/vuln/370864
[Other]https://vuldb.com/vuln/370864/cti

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CVE-2026-12222 — A vulnerability was determined in Yealink SIP-T46U 108.86.0.118 (8.0 HIGH)
CVE-2026-12220 — A vulnerability has been found in Yealink SIP-T46U 108.86.0.118 (8.0 HIGH)