Buffer overflow in Yealink Sip-T46u
CVE-2026-12218
A vulnerability was detected in Yealink SIP-T46U 108.87.50.1. The affected element is the function StartReportInformation of the file /api/inner/beforewifitest of the component Web FastCGI Service. The manipulation of the argument port results in stack-based buffer overflow. Access to the local network is required for this attack. The exploit is now public and may be used. The vendor was contacted early about this disclosure and is working on a patch to fix it.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Yealink Sip-T46u — versions 108.87.50.1
Weakness classification (CWE)
References
- cdn2.v50to.cc/T46U/T46U_beforewifitest_stack_overflow.zip (exploit, broken-link)
- vuldb.com/cve/CVE-2026-12218 (third-party-advisory)
- vuldb.com/submit/834193 (third-party-advisory)
- vuldb.com/vuln/370861 (technical-description, vdb-entry)
- vuldb.com/vuln/370861/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-12218?
- CVE-2026-12218 is a high-severity vulnerability in Yealink Sip-T46u, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.0/10. Published 2026-06-15.
- How severe is CVE-2026-12218?
- High severity. CVSS v3 base score is 8.0 out of 10.