{"id":"CVE-2026-12220","state":"PUBLISHED","title":"Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpload stack-based overflow","description":"A vulnerability has been found in Yealink SIP-T46U 108.86.0.118. This affects the function mod_upgrade.SparePartsUpload of the file /api/upgrade/accupgradebychunk of the component Firmware Chunk Upload handler. Such manipulation of the argument uid leads to stack-based buffer overflow. The attack can only be initiated within the local network. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure and is working on a patch to fix it.","publishedAt":"2026-06-15T04:45:10.866Z","updatedAt":"2026-06-27T05:45:11.834Z","severity":{"score":8.6,"label":"High","version":"4.0","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","source":"VulDB"},"assigner":"VulDB","products":["Yealink SIP-T46U"],"affected":[{"vendor":"Yealink","product":"SIP-T46U","versions":[{"version":"108.86.0.118","status":"affected"}],"cpes":["cpe:2.3:a:yealink:sip-t46u:*:*:*:*:*:*:*:*"],"modules":["Firmware Chunk Upload handler"]}],"references":["https://vuldb.com/vuln/370863","https://vuldb.com/vuln/370863/cti","https://vuldb.com/cve/CVE-2026-12220","https://vuldb.com/submit/834205","http://cdn2.v50to.cc/T46U/T46U_mod_upgrade_SparePartsUpload_stack_overflow.zip"],"weaknesses":["CWE-121","CWE-119"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/12xxx/CVE-2026-12220.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-12220","state":"PUBLISHED","datePublished":"2026-06-15T04:45:10.866Z","dateUpdated":"2026-06-27T05:45:11.834Z","assignerShortName":"VulDB","assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateReserved":"2026-06-14T13:54:16.276Z"},"containers":{"cna":{"title":"Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpload stack-based overflow","descriptions":[{"lang":"en","value":"A vulnerability has been found in Yealink SIP-T46U 108.86.0.118. This affects the function mod_upgrade.SparePartsUpload of the file /api/upgrade/accupgradebychunk of the component Firmware Chunk Upload handler. Such manipulation of the argument uid leads to stack-based buffer overflow. The attack can only be initiated within the local network. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure and is working on a patch to fix it."}],"affected":[{"vendor":"Yealink","product":"SIP-T46U","versions":[{"version":"108.86.0.118","status":"affected"}],"cpes":["cpe:2.3:a:yealink:sip-t46u:*:*:*:*:*:*:*:*"],"modules":["Firmware Chunk Upload handler"]}],"references":[{"url":"https://vuldb.com/vuln/370863","name":"VDB-370863 | Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpload stack-based overflow","tags":["vdb-entry","technical-description"]},{"url":"https://vuldb.com/vuln/370863/cti","name":"VDB-370863 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"]},{"url":"https://vuldb.com/cve/CVE-2026-12220","name":"CVE-2026-12220 | CVE Analysis and Report","tags":["third-party-advisory"]},{"url":"https://vuldb.com/submit/834205","name":"Submit #834205 | yealink T46U 108.86.0.118 Stack-based Buffer Overflow","tags":["third-party-advisory"]},{"url":"http://cdn2.v50to.cc/T46U/T46U_mod_upgrade_SparePartsUpload_stack_overflow.zip","tags":["broken-link","exploit","patch"]}],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":8.6,"vectorString":"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","baseSeverity":"HIGH"}},{"cvssV3_1":{"version":"3.1","baseScore":8,"vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:C","baseSeverity":"HIGH"}},{"cvssV3_0":{"version":"3.0","baseScore":8,"vectorString":"CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:C","baseSeverity":"HIGH"}},{"cvssV2_0":{"version":"2.0","baseScore":7.7,"vectorString":"AV:A/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:C"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-121","type":"CWE","lang":"en","description":"Stack-based Buffer Overflow"}]},{"descriptions":[{"cweId":"CWE-119","type":"CWE","lang":"en","description":"Memory Corruption"}]}],"providerMetadata":{"shortName":"VulDB","orgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateUpdated":"2026-06-27T05:45:11.834Z"},"timeline":[{"time":"2026-06-14T00:00:00.000Z","lang":"en","value":"Advisory disclosed"},{"time":"2026-06-14T02:00:00.000Z","lang":"en","value":"VulDB entry created"},{"time":"2026-06-27T07:46:51.000Z","lang":"en","value":"VulDB entry last update"}],"credits":[{"lang":"en","value":"CookedMelon (VulDB User)","type":"reporter"},{"lang":"en","value":"VulDB CNA Team","type":"coordinator"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-15T15:52:49.971836Z","id":"CVE-2026-12220","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-15T19:24:51.540Z"}}]}}}