Yealink SIP-T46U Firmware Chunk Upload upgrade sprintf stack-based overflow_CVE-2026-12221

{
    "lastseen": "",
    "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.",
    "published": "2026-06-15T05:00:10.661Z",
    "modified": "2026-06-15T05:00:10.661Z",
    "type": "cve",
    "title": "Yealink SIP-T46U Firmware Chunk Upload upgrade sprintf stack-based overflow",
    "source": "VulDB",
    "references": "https://vuldb.com/vuln/370864\nhttps://vuldb.com/vuln/370864/cti\nhttps://vuldb.com/cve/CVE-2026-12221\nhttps://vuldb.com/submit/834207\nhttp://cdn2.v50to.cc/T46U/T46U_mod_upgrade_Upgrade_chunk_stack_overflow.zip",
    "id": "CVE-2026-12221",
    "bulletinFamily": "",
    "cwe": [
        "CWE-121",
        "CWE-119"
    ],
    "cvelist": null,
    "sourceData": "Yealink SIP-T46U 108.86.0.118",
    "sourceHref": "",
    "cvss": {
        "score": 8.6,
        "severity": "HIGH",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "SIP-T46U",
    "version": "108.86.0.118",
    "vendor": "Yealink",
    "ai_description": "Stack-based buffer overflow vulnerability in Yealink SIP-T46U via the Firmware Chunk Upload Handler",
    "ai_severity": "High",
    "ai_vendor": "Yealink",
    "ai_product": "SIP-T46U",
    "ai_version": "108.86.0.118",
    "ai_score": 8.6
}