{"id":"CVE-2026-100737","kind":"vulnerability","aliases":["CVE-2026-100737"],"related":[],"title":"Atsumi Electric DVRs: admin can flash unauthorized firmware via hidden function","description":"Hidden functionality issue exists in Multiple DVRs (Digital Video Recorders) provided by Atsumi Electric Co., Ltd. A user who can log in to the product with the administrator privilege may upgrade the affected product to unauthorized firmware.","summary":"Several Atsumi Electric digital video recorders contain a hidden function that lets a logged-in administrator upgrade the device to unauthorized firmware. An attacker holding admin credentials could replace the device's software with their own.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["atsumi-electric","dvr","firmware","infrastructure","iot"],"not_affected_if":["no-atsumi-dvr"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-20T06:16:56+00:00","first_seen_at":"2026-10-23T21:57:20+00:00","triaged_at":"2026-10-25T03:40:38+00:00","updated_at":"2026-10-25T03:40:38+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-25T03:40:38Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Atsumi Electric DVRs: admin can flash unauthorized firmware via hidden function","impact":"high","summary":"Several Atsumi Electric digital video recorders contain a hidden function that lets a logged-in administrator upgrade the device to unauthorized firmware. An attacker holding admin credentials could replace the device's software with their own.","category":"infrastructure","nicknames":[],"who_cares":["dvr","atsumi-electric","iot","firmware"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker with admin login installs unauthorized firmware on the recorder","analyst_note":"Find the affected model and firmware list and the vendor fixed firmware on the JVN or Atsumi Electric advisory, starting from the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-100737.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["no-atsumi-dvr"],"who_is_affected":"Owners of Atsumi Electric DVR models that expose the hidden firmware upgrade path to administrators. The sources do not list affected model numbers or firmware versions, so the exposure of a specific unit cannot be confirmed from this text. Teams that do not run Atsumi Electric DVRs can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000584,"input_tokens":3315,"output_tokens":504,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-100737':14A,17A '-2026':13A,16A 'admin':4A,51B 'administr':41B,86C 'affect':91C 'atsumi':1A,19B,26B,71C 'atsumi-electr':18B 'attack':49B 'co':73C 'contain':31B 'could':53B 'credenti':52B 'cve':12A,15A 'devic':44B,56B 'digit':28B,66C 'dvr':21B 'dvrs':3A,65C 'electr':2A,20B,27B,72C 'exist':62C 'firmwar':8A,22B,47B,95C 'flash':6A 'function':11A,34B,60C 'hidden':10A,33B,59C 'hold':50B 'infrastructur':23B 'iot':24B 'issu':61C 'let':36B 'log':39B,79C 'logged-in':38B 'ltd':74C 'may':88C 'multipl':64C 'privileg':87C 'product':83C,92C 'provid':69C 'record':30B,68C 'replac':54B 'sever':25B 'softwar':58B 'unauthor':7A,46B,94C 'upgrad':42B,89C 'user':76C 'via':9A 'video':29B,67C","nicknames":[],"mitigations":[],"who_affected":"Owners of Atsumi Electric DVR models that expose the hidden firmware upgrade path to administrators. The sources do not list affected model numbers or firmware versions, so the exposure of a specific unit cannot be confirmed from this text. Teams that do not run Atsumi Electric DVRs can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T06:16:56+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"vultures@jpcert.or.jp","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-100737","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100737","severity":null,"published_at":"2026-10-20T06:16:56+00:00","modified_at":"2026-10-20T20:17:11+00:00","first_seen_at":"2026-10-23T21:57:20+00:00","fetched_at":"2026-10-23T22:28:57+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}