CVE-2026-12222 Yealink SIP-T46U Web FastCGI Service bttest mod_webd.BlueToothTest stack-based overflow
A stack-based buffer overflow in the Yealink SIP-T46U web service allows local network attackers to execute arbitrary code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12222?
CVE-2026-12222 is a high-severity memory corruption vulnerability in Yealink SIP-T46U, published on 15 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-12222?
How do I fix CVE-2026-12222?
No fix has been published for CVE-2026-12222 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-12222 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12222 exists.
Sources
Also known as GHSA-3c47-ghg7-jxpp.