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CVE-2026-12223— Yealink SIP-T46U Web FastCGI Service tftpuploadiperf mod_webd.TFTPUploadIperf command injection

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 108.86.0.118版本存在安全漏洞，该漏洞源于组件Web FastCGI Service的文件/api/inner/tftpuploadiperf中函数mod_webd.TFTPUploadIperf对参数ip/port的操作不当，导致命令注入。

CVSS 5.5 · Medium EPSS 1.19% · P65

Affected Version Matrix 2

VendorProduct Version RangeStatus
Yealink SIP-T46U 108.86.0.118 affected
108.87.0.23 unaffected
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I. Basic Information for CVE-2026-12223

Vulnerability Information
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Vulnerability Title
Yealink SIP-T46U Web FastCGI Service tftpuploadiperf mod_webd.TFTPUploadIperf command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in Yealink SIP-T46U 108.86.0.118. Affected by this vulnerability is the function mod_webd.TFTPUploadIperf of the file /api/inner/tftpuploadiperf of the component Web FastCGI Service. The manipulation of the argument ip/port leads to command injection. The attack needs to be initiated within the local network. The exploit is publicly available and might be used. Upgrading to version 108.87.0.23 addresses this issue. Upgrading the affected component is recommended. The vendor explains: "It has been fixed (...) for our technical support branch. However, please note that this specific support branch firmware is not publicly released yet."
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Yealink sip-t46u 输入验证错误漏洞
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 108.86.0.118版本存在安全漏洞，该漏洞源于组件Web FastCGI Service的文件/api/inner/tftpuploadiperf中函数mod_webd.TFTPUploadIperf对参数ip/port的操作不当，导致命令注入。
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-2026-12223

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III. Intelligence Information for CVE-2026-12223

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Exploits & Public PoCs for CVE-2026-12223 (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-2026-12222 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

IV. Related Vulnerabilities

Same product: SIP-T46U
Same vendor: Yealink
Same weakness: CWE-77

V. Comments for CVE-2026-12223

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