{"id":"CVE-2026-45341","kind":"vulnerability","aliases":["CVE-2026-45341"],"related":[],"title":"BACnet Stack: crafted WriteProperty request crashes device via NULL pointer","description":"BACnet Stack is a BACnet open source protocol stack C library for embedded systems. From versions 1.4.0 to before 1.4.4, and 1.5.0 to before 1.5.1, a NULL pointer dereference can be triggered in bacnet_device_object_reference_decode() when a WriteProperty request updates OBJECT_STRUCTURED_VIEW / PROP_SUBORDINATE_LIST. This issue has been patched in versions 1.4.4 and 1.5.1.","summary":"BACnet Stack is an open source BACnet protocol C library used in embedded building-automation devices. A crafted WriteProperty request that updates a structured view's subordinate list triggers a NULL pointer dereference, which can crash the device.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["bacnet","building-automation","c","embedded","package"],"not_affected_if":["no-structured-view-objects","writes-restricted-to-trusted-network"],"how_to_check":null,"fix":"- BACnet Stack `1.4.4` for the 1.4 line\n- BACnet Stack `1.5.1` for the 1.5 line","status":"open","published_at":"2026-11-12T20:18:38+00:00","first_seen_at":"2026-11-12T20:40:26+00:00","triaged_at":"2026-11-12T20:42:13+00:00","updated_at":"2026-11-12T20:42:13+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-12T20:42:13Z","model":"claude-haiku-5-5","output":{"fix":"- BACnet Stack `1.4.4` for the 1.4 line\n- BACnet Stack `1.5.1` for the 1.5 line","reach":"network","title":"BACnet Stack: crafted WriteProperty request crashes device via NULL pointer","impact":"low","summary":"BACnet Stack is an open source BACnet protocol C library used in embedded building-automation devices. A crafted WriteProperty request that updates a structured view's subordinate list triggers a NULL pointer dereference, which can crash the device.","audience":"developers","category":"package","nicknames":[],"who_cares":["bacnet","embedded","building-automation","c"],"confidence":0.7,"fix_status":"available","needs_auth":"unknown","worst_case":"Device crashes on a crafted WriteProperty request","analyst_note":"","how_to_check":"- Check the BACnet Stack version in your build: versions `1.4.0` through `1.4.3` and `1.5.0` are affected.\n- Look for OBJECT_STRUCTURED_VIEW objects that accept WriteProperty to PROP_SUBORDINATE_LIST.","plain_action":"","product_name":"bacnet-stack","needs_analyst":false,"not_affected_if":["no-structured-view-objects","writes-restricted-to-trusted-network"],"who_is_affected":"Teams that build firmware or gateways on the BACnet Stack C library and expose BACnet WriteProperty to a network. The flaw is in the device object reference decode path, reached when a WriteProperty request updates a structured view's subordinate list. Devices that do not implement structured view objects or do not accept writes from untrusted networks are less exposed.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000776,"input_tokens":4626,"output_tokens":627,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-45341':13A,16A '1.4.0':79C '1.4.4':82C,119C '1.5.0':84C '1.5.1':87C,121C 'autom':20B,39B 'bacnet':1A,17B,24B,30B,63C,67C,96C 'build':19B,38B 'building-autom':18B,37B 'c':21B,32B,72C 'craft':3A,42B 'crash':6A,60B 'cve':11A,14A 'decod':100C 'derefer':57B,91C 'devic':7A,40B,62B,97C 'embed':22B,36B,75C 'issu':113C 'librari':33B,73C 'list':52B,111C 'null':9A,55B,89C 'object':98C,106C 'open':28B,68C 'packag':23B 'patch':116C 'pointer':10A,56B,90C 'prop':109C 'protocol':31B,70C 'refer':99C 'request':5A,44B,104C 'sourc':29B,69C 'stack':2A,25B,64C,71C 'structur':48B,107C 'subordin':51B,110C 'system':76C 'trigger':53B,94C 'updat':46B,105C 'use':34B 'version':78C,118C 'via':8A 'view':49B,108C 'writeproperti':4A,43B,103C","nicknames":[],"mitigations":[],"who_affected":"Teams that build firmware or gateways on the BACnet Stack C library and expose BACnet WriteProperty to a network. The flaw is in the device object reference decode path, reached when a WriteProperty request updates a structured view's subordinate list. Devices that do not implement structured view objects or do not accept writes from untrusted networks are less exposed.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["bacnet","buildingautomation","c","embedded","high","package"],"campaign_type":null,"search_a":"'-2026':12A,15A '-45341':13A,16A 'bacnet':1A 'craft':3A 'crash':6A 'cve':11A,14A 'devic':7A 'null':9A 'pointer':10A 'request':5A 'stack':2A 'via':8A 'writeproperti':4A","search_b":"'autom':20B,39B 'bacnet':17B,24B,30B 'build':19B,38B 'building-autom':18B,37B 'c':21B,32B 'craft':42B 'crash':60B 'derefer':57B 'devic':40B,62B 'embed':22B,36B 'librari':33B 'list':52B 'null':55B 'open':28B 'packag':23B 'pointer':56B 'protocol':31B 'request':44B 'sourc':29B 'stack':25B 'structur':48B 'subordin':51B 'trigger':53B 'updat':46B 'use':34B 'view':49B 'writeproperti':43B","search_c":"'1.4.0':79C '1.4.4':82C,119C '1.5.0':84C '1.5.1':87C,121C 'bacnet':63C,67C,96C 'c':72C 'decod':100C 'derefer':91C 'devic':97C 'embed':75C 'issu':113C 'librari':73C 'list':111C 'null':89C 'object':98C,106C 'open':68C 'patch':116C 'pointer':90C 'prop':109C 'protocol':70C 'refer':99C 'request':104C 'sourc':69C 'stack':64C,71C 'structur':107C 'subordin':110C 'system':76C 'trigger':94C 'updat':105C 'version':78C,118C 'view':108C 'writeproperti':103C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-07-05T02:02:31+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-45341","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45341","severity":null,"published_at":"2026-11-12T20:18:38+00:00","modified_at":"2026-11-12T20:18:38+00:00","first_seen_at":"2026-11-12T20:40:26+00:00","fetched_at":"2026-11-12T20:40:26+00:00","note":null}],"documents":[{"id":138275,"url":"https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-fv2r-c2m2-7qhh","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-07-05T02:02:31+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}