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CVE-2026-12221

HIGH
8.0
CVSS 3.1
Description
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 results in stack-based buffer overflow. The attack needs to be approached within the local network. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Metadata

CVE ID
CVE-2026-12221
State
PUBLISHED
Assigner
VulDB
Reserved
2026-06-14 13:54 UTC
Published
2026-06-15 05:00 UTC
Last updated
2026-06-15 12:50 UTC
Primary CWE
CWE-121
Stack-based Buffer Overflow
Vendor / Product
Yealink / SIP-T46U
Sources
cve.org  ·  NVD

Severity & Metrics

8.0 HIGH CVSS 3.1
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
Yealink SIP-T46U — 108.86.0.118
Weakness (CWE)
CWESourceDescription
CWE-119 cna Memory Corruption
CWE-121 cna Stack-based Buffer Overflow
CVSS scores (4)
ScoreSeverityVersionSourceVector
8.6 HIGH 4.0 cna CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
8.0 HIGH 3.1 cna CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
8.0 HIGH 3.0 cna CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
7.7 N/D 2.0 cna AV:A/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
References (5)
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