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PatchSiren cyber security CVE debrief

CVE-2026-12223 Yealink CVE debrief

A vulnerability was identified in Yealink SIP-T46U 108.86.0.118. The function mod_webd.TFTPUploadIperf of the file /api/inner/tftpuploadiperf of the component Web FastCGI Service is affected. 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. The vendor was contacted early about this disclosure but did not respond in any way.

Vendor
Yealink
Product
SIP-T46U
CVSS
LOW 2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-15
Original CVE updated
2026-06-27
Advisory published
2026-06-15
Advisory updated
2026-06-27

Who should care

Administrators and users of Yealink SIP-T46U 108.86.0.118 within local networks should be aware of this vulnerability and take necessary precautions.

Technical summary

The vulnerability has a CVSS score of 2 and is classified as LOW severity. It is related to CWE-74 and CWE-77. The CVSS vector is CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

Defensive priority

Low

Recommended defensive actions

  • Update to a patched version if available.
  • Restrict access to the Web FastCGI Service.
  • Monitor for suspicious activity within the local network.

Evidence notes

The vendor was contacted but did not respond. The exploit is publicly available.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12223 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12223

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-12223 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12223

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.