CVE-2026-12223
MediumCVSS 5.5Exploitation Probability (EPSS)
Elevated risk65th percentile - higher than 65% of all known CVEs
Summary
A vulnerability in Yealink SIP-T46U 108.86.0.118. The mod_webd.TFTPUploadIperf function in /api/inner/tftpuploadiperf of the Web FastCGI Service component allows command injection via ip/port arguments. Local network attack, exploit public. Fixed in version 108.87.0.23.
Risk Assessment
An attacker on the local network can execute commands on the Yealink phone, enabling call eavesdropping or device takeover.
Recommendation
Update Yealink SIP-T46U to version 108.87.0.23 or later.
Other vulnerabilities in Yealink SIP-T46U
See all- CVE-2026-12222High
Vulnerability in Yealink SIP-T46U version 108.86.0.118 in the Web FastCGI Service component (mod_webd.BlueToothTest function in /api/inner/bttest). Manipulation of btMac/pin/reserved arguments leads to stack-based buffer overflow. Attack requires local network access.
- CVE-2026-12221High
Vulnerability in Yealink SIP-T46U version 108.86.0.118 in the Firmware Chunk Upload Handler component (sprintf function in /api/upgrade/upgrade). Manipulation of uid/start_offset arguments leads to stack-based buffer overflow. Attack requires local network access.
- CVE-2026-12220High
Vulnerability in Yealink SIP-T46U version 108.86.0.118 in the Firmware Chunk Upload Handler component (mod_upgrade.SparePartsUpload function in /api/upgrade/accupgradebychunk). Manipulation of uid argument leads to stack-based buffer overflow. Attack requires local network access.
- CVE-2026-12219Medium
A vulnerability has been found in Yealink SIP-T46U version 108.86.0.118, allowing command injection in the mod_diagnose.CommandShellByType function of /api/diagnosis/start. The attack can be launched remotely by manipulating the Time argument. The issue is fixed in version 108.87.0.23.
- CVE-2026-12218High
Vulnerability in Yealink SIP-T46U version 108.87.50.1 in the Web FastCGI Service component (StartReportInformation function in /api/inner/beforewifitest). Manipulation of port argument leads to stack-based buffer overflow. Attack requires local network access.
Original NVD description (English source)
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."