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CVE-2026-12222— Yealink SIP-T46U Web FastCGI Service bttest mod_webd.BlueToothTest 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 108.86.0.108版本存在缓冲区错误漏洞，该漏洞源于文件/api/inner/bttest中Web FastCGI Service组件的mod_webd.BlueToothTest函数中参数btMac/pin/reserved操作不当，可能导致栈缓冲区溢出。

CVSS 8.0 · High EPSS 0.37% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
Yealink SIP-T46U 108.86.0.118 affected
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I. Basic Information for CVE-2026-12222

Vulnerability Information
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Vulnerability Title
Yealink SIP-T46U Web FastCGI Service bttest mod_webd.BlueToothTest stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in Yealink SIP-T46U 108.86.0.118. Affected is the function mod_webd.BlueToothTest of the file /api/inner/bttest of the component Web FastCGI Service. Executing a manipulation of the argument btMac/pin/reserved can lead to stack-based buffer overflow. The attack needs to be done within the local network. The exploit has been publicly disclosed and may be utilized. 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 108.86.0.108版本存在缓冲区错误漏洞，该漏洞源于文件/api/inner/bttest中Web FastCGI Service组件的mod_webd.BlueToothTest函数中参数btMac/pin/reserved操作不当，可能导致栈缓冲区溢出。
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-2026-12222

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III. Intelligence Information for CVE-2026-12222

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Exploits & Public PoCs for CVE-2026-12222 (1)

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

CVE-2026-12220 8.0 HIGH Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpl
CVE-2026-12218 8.0 HIGH Yealink SIP-T46U Web FastCGI Service beforewifitest StartReportInformation stack-based ove
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-2026-12222

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