Is CVE-2026-12222 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-12222 being exploited in the wild.

How severe is CVE-2026-12222?

High severity, with a CVSS score of 8, published 15 June 2026.

Is there a fix for CVE-2026-12222?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-12222 attacked?

It is attacked from the adjacent network, in a network appliance.

Am I affected by CVE-2026-12222?

Check whether you run Yealink SIP-T46U at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-12222: Yealink SIP-T46U stack buffer overflow in Web FastCGI Service

CVE-2026-12222 · Severity: high · CVSS 8 · Published 2026-06-15

A security vulnerability exists in the Yealink SIP-T46U IP phone, a device commonly used for business telecommunications. An attacker on the same local network could exploit this flaw to crash the device or potentially take control of it. This could lead to a disruption of phone services or unauthorized access to the device's functions.

Technologies: Yealink SIP-T46U. Vendors: Yealink.

Quick answers

Is CVE-2026-12222 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-12222 being exploited in the wild.
How severe is CVE-2026-12222?: High severity, with a CVSS score of 8, published 15 June 2026.
Which products and versions are affected?: Yealink SIP-T46U 108.86.0.118.
Is there a fix for CVE-2026-12222?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-12222 attacked?: It is attacked from the adjacent network, in a network appliance.
Am I affected by CVE-2026-12222?: Check whether you run Yealink SIP-T46U at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A stack-based buffer overflow vulnerability (CWE-121) exists in the Yealink SIP-T46U firmware version 108.86.0.118. The flaw is located within the mod_webd.BlueToothTest function in the /api/inner/bttest endpoint of the Web FastCGI Service. By manipulating the btMac, pin, or reserved arguments, an attacker with low privileges on the local network can trigger the overflow. This can lead to full system compromise (confidentiality, integrity, and availability impact). As of the advisory date, the vendor has not responded to disclosure attempts, and an exploit has been publicly released.

Affected products

Yealink SIP-T46U 108.86.0.118

Timeline

2026-06-15: disclosed: Public disclosure of the vulnerability and exploit
2026-06-15: advisory: CVE-2026-12222 published to NVD

References

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