What’s Vulnerable › Vulnerabilities

CVE-2026-12222: Yealink SIP-T46U Web FastCGI Service bttest mod_webd.BlueToothTest stack-based overflow

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-15 · updated 2026-07-24
• Weakness: CWE-119

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.

Affected products

• Yealink SIP-T46U: 108.86.0.118

References

• http://cdn2.v50to.cc/T46U/T46U_mod_webd_BlueToothTest_off_by_one.zip
• https://vuldb.com/cve/CVE-2026-12222
• https://vuldb.com/submit/834602
• https://vuldb.com/vuln/370865
• https://vuldb.com/vuln/370865/cti

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