Is CVE-2026-12218 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-12218 being exploited in the wild.

How severe is CVE-2026-12218?

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

Is there a fix for CVE-2026-12218?

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-2026-12218 attacked?

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

Am I affected by CVE-2026-12218?

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-2026-12218: Yealink SIP-T46U stack-based buffer overflow in Web FastCGI Service

CVE-2026-12218 · Severity: high · CVSS 8 · Published 2026-06-15

A security vulnerability has been identified in Yealink SIP-T46U business desk phones. 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 unauthorized access to communication data or a complete disruption of phone services. The manufacturer was notified but has not yet provided a fix.

Technologies: Yealink SIP-T46U. Vendors: Yealink.

Quick answers

Is CVE-2026-12218 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-12218 being exploited in the wild.
How severe is CVE-2026-12218?: High severity, with a CVSS score of 8, published 15 June 2026.
Which products and versions are affected?: Yealink SIP-T46U 108.87.50.1.
Is there a fix for CVE-2026-12218?: 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-2026-12218 attacked?: It is attacked from the adjacent network, in a network appliance.
Am I affected by CVE-2026-12218?: 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 (CWE-121) exists in the Yealink SIP-T46U firmware version 108.87.50.1. The vulnerability is located within the StartReportInformation function of the /api/inner/beforewifitest file, which is part of the Web FastCGI Service component. An attacker with local network access can trigger the overflow by manipulating the 'port' argument. Successful exploitation could lead to remote code execution or a denial-of-service (DoS) condition. While the vendor was contacted, no patch has been confirmed at this time, and public exploit code is reportedly available.

Affected products

Yealink SIP-T46U 108.87.50.1

Timeline

2026-06-15: disclosed: Public disclosure of the vulnerability and exploit code.
2026-06-15: advisory: NVD published the CVE record.

References

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