CVE-2026-12220
Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpload stack-based overflow
- State
- Published
- Severity
- 8.6 High
- Published
- Jun 15, 2026
- Updated
- Jun 27, 2026
- Reserved
- Jun 14, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.6 High | 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 | VulDB |
| 3.1 | 8.0 High | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:C | VulDB |
| 3.0 | 8.0 High | CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:C | VulDB |
| 2.0 | 7.7 High | AV:A/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:C | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
SIP-T46UYealink |
|
References
- VDB-370863 | Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpload stack-based overflowvdb-entrytechnical-description
- VDB-370863 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- CVE-2026-12220 | CVE Analysis and Reportthird-party-advisory
- Submit #834205 | yealink T46U 108.86.0.118 Stack-based Buffer Overflowthird-party-advisory
- http://cdn2.v50to.cc/T46U/T46U_mod_upgrade_SparePartsUpload_stack_overflow.zipbroken-linkexploitpatch
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