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CVE-2026-12220— Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpload stack-based overflow

Quick assessment

Affected
Yealink SIP-T46U
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

sip-t46u是中国Yealink公司的一款IP电话终端设备。 Yealink SIP-T46U 108.86.0.86版本存在缓冲区错误漏洞，该漏洞源于Firmware Chunk Upload handler组件中函数mod_upgrade.SparePartsUpload对参数uid操作不当，导致栈缓冲区溢出，攻击者只可在本地网络发起攻击。

CVSS 8.0 · High EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Yealink SIP-T46U 108.86.0.118 affected
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I. Basic Information for CVE-2026-12220

Vulnerability Information
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Vulnerability Title
Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpload stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Yealink sip-t46u 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sip-t46u是中国Yealink公司的一款IP电话终端设备。 Yealink SIP-T46U 108.86.0.86版本存在缓冲区错误漏洞，该漏洞源于Firmware Chunk Upload handler组件中函数mod_upgrade.SparePartsUpload对参数uid操作不当，导致栈缓冲区溢出，攻击者只可在本地网络发起攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Yealink SIP-T46U 108.86.0.118 cpe:2.3:a:yealink:sip-t46u:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-12220

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III. Intelligence Information for CVE-2026-12220

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Other References for CVE-2026-12220 (1)

Same Patch Batch · Yealink · 2026-06-15 · 6 CVEs total

CVE-2026-12218 8.0 HIGH Yealink SIP-T46U Web FastCGI Service beforewifitest StartReportInformation stack-based ove
CVE-2026-12222 8.0 HIGH Yealink SIP-T46U Web FastCGI Service bttest mod_webd.BlueToothTest stack-based overflow
CVE-2026-12221 8.0 HIGH Yealink SIP-T46U Firmware Chunk Upload upgrade sprintf stack-based overflow
CVE-2026-12219 6.3 MEDIUM Yealink SIP-T46U Web FastCGI Service start mod_diagnose.CommandShellByType command injecti
CVE-2026-12223 5.5 MEDIUM Yealink SIP-T46U Web FastCGI Service tftpuploadiperf mod_webd.TFTPUploadIperf command inje

IV. Related Vulnerabilities

Same product: SIP-T46U
Same vendor: Yealink
Same weakness: CWE-121

V. Comments for CVE-2026-12220

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