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CVE-2026-12222 Yealink CVE debrief

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 but did not respond in any way.

Vendor
Yealink
Product
SIP-T46U
CVSS
HIGH 7.3
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 actions to mitigate the risk.

Technical summary

The vulnerability, CVE-2026-12222, is a stack-based buffer overflow issue in the mod_webd.BlueToothTest function of the Yealink SIP-T46U 108.86.0.118 device. This function is part of the Web FastCGI Service and is located in the /api/inner/bttest file. The vulnerability can be exploited by manipulating the btMac, pin, and reserved arguments, allowing for a stack-based buffer overflow. This type of attack requires local network access.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by the vendor as soon as they are available.
  • Restrict access to the affected component to only necessary personnel.
  • Monitor network traffic for suspicious activity related to the affected device.
  • Consider implementing additional security measures such as network segmentation and intrusion detection systems.

Evidence notes

The CVSS score for this vulnerability is 7.3, indicating a high severity. The vulnerability is publicly disclosed and may be utilized by attackers.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12222 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12222

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

  • CVE-2026-12222 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12222

    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.