What is CVE-2026-12221?

CVE-2026-12221 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-2026-12221?

High severity. CVSS v3 base score is 8.0 out of 10.

Buffer overflow in Yealink Sip-t46u

CVE-2026-12221

A vulnerability was found in Yealink SIP-T46U 108.86.0.118. This impacts the function sprintf of the file /api/upgrade/upgrade of the component Firmware Chunk Upload Handler. Performing a manipulation of the argument uid/start_offset resul…

Vulnerability class: Buffer Overflow

EPSS: 0.004 (28.7th percentile) — read the EPSS interpretation.

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.

Affected products

Yealink Sip-t46u — versions 108.86.0.118

Weakness classification (CWE)

References

cna@vuldb.com (exploit, patch, broken-link)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)

Frequently asked questions

What is CVE-2026-12221?: CVE-2026-12221 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-2026-12221?: High severity. CVSS v3 base score is 8.0 out of 10.