CVE-2026-12221

high

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.

References

https://vuldb.com/vuln/370864/cti

https://vuldb.com/vuln/370864

https://vuldb.com/submit/834207

https://vuldb.com/cve/CVE-2026-12221

http://cdn2.v50to.cc/T46U/T46U_mod_upgrade_Upgrade_chunk_stack_overflow.zip

Details

Source: Mitre, NVD

Published: 2026-06-15

Updated: 2026-06-15

Risk Information

CVSS v2

Base Score: 7.7

Vector: CVSS2#AV:A/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8

Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 8.6

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

Severity: High