{"id":"CVE-2020-5735","kind":"vulnerability","aliases":["CVE-2020-5735"],"related":[],"title":"Amcrest Cameras and Network Video Recorder (NVR): Amcrest Cameras and NVR Stack-based Buffer Overflow Vulnerability","description":"Amcrest cameras and NVR contain a stack-based buffer overflow vulnerability through port 37777 that allows an unauthenticated, remote attacker to crash the device and possibly execute code.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Amcrest cameras and network video recorders have a stack-based buffer overflow reachable over TCP port 37777. An unauthenticated remote attacker can crash the device and possibly run code on it.","severity":"high","cvss":8.8,"epss":0.36217,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Amcrest Cameras and Network Video Recorder (NVR)","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["amcrest","exploited","infrastructure","ip-cameras","nvr","self-hosted"],"not_affected_if":["no-amcrest-devices","port-37777-not-exposed"],"how_to_check":null,"fix":"Apply the vendor update per Amcrest instructions; the affected and fixed firmware versions are not stated in the sources.\nIf no patch is available, block inbound TCP 37777 from untrusted networks.","status":"open","published_at":"2020-04-08T13:15:13+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:37:15+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:37:15Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor update per Amcrest instructions; the affected and fixed firmware versions are not stated in the sources.\nIf no patch is available, block inbound TCP 37777 from untrusted networks.","reach":"internet","impact":"high","summary":"Amcrest cameras and network video recorders have a stack-based buffer overflow reachable over TCP port 37777. An unauthenticated remote attacker can crash the device and possibly run code on it.","category":"infrastructure","who_cares":["amcrest","ip-cameras","nvr","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"Unauthenticated attacker may execute code on camera or NVR","analyst_note":"Find the Amcrest advisory and the list of affected and fixed firmware versions; CISA KEV entry lists it as known exploited so confirm the fixed firmware and a check command.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["port-37777-not-exposed","no-amcrest-devices"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000487,"input_tokens":2882,"output_tokens":397,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find the Amcrest advisory and the list of affected and fixed firmware versions; CISA KEV entry lists it as known exploited so confirm the fixed firmware and a check command.","search":"'-2020':19A,22A '-5735':20A,23A '37777':58B,85C 'action':102C 'allow':87C 'amcrest':1A,8A,24A,31B,41B,71C 'and':26A 'appli':103C 'attack':62B,91C 'base':14A,51B,79C 'buffer':15A,52B,80C 'camera':2A,9A,36B,42B,72C 'cameras':25A 'cisa':100C 'code':70B,99C 'contain':75C 'crash':64B,93C 'cve':18A,21A 'devic':66B,95C 'execut':98C 'exploit':32B 'host':40B 'infrastructur':33B 'instruct':107C 'ip':35B 'ip-camera':34B 'network':4A,27A,44B 'nvr':7A,11A,30A,37B,74C 'overflow':16A,53B,81C 'per':105C 'port':57B,84C 'possibl':68B,97C 'reachabl':54B 'record':6A,46B 'recorder':29A 'remot':61B,90C 'requir':101C 'run':69B 'self':39B 'self-host':38B 'stack':13A,50B,78C 'stack-bas':12A,49B,77C 'tcp':56B 'unauthent':60B,89C 'updat':104C 'vendor':106C 'video':5A,28A,45B 'vulner':17A,82C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2020-04-08T13:15:13+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2020-5735","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-5735","severity":null,"published_at":"2021-11-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T15:39:43+00:00","note":null},{"source":"epss","external_id":"CVE-2020-5735","url":"https://api.first.org/data/v1/epss?cve=CVE-2020-5735","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2020-5735","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5735","severity":null,"published_at":"2020-04-08T13:15:13+00:00","modified_at":"2026-06-17T03:22:08+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+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"}