{"id":"CVE-2026-111731","kind":"vulnerability","aliases":["CVE-2026-111731"],"related":[],"title":"P-Net: infinite loop on a PROFINET read request halts the device","description":"P-Net before 1.0.3 enters an infinite loop when handling a read request for the PDPortDataCheck record with subslot 0 (whole module). The loop over the ports never advanced to the next port, so the request never completes and the device stops responding. A remote unauthenticated attacker can use this to cause a denial of service.","summary":"P-Net, a PROFINET device stack, loops forever when it handles a read request for the PDPortDataCheck record on subslot 0 (the whole module). The device stops responding, so an unauthenticated remote attacker can cause a denial of service.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["embedded","industrial-control","infrastructure","p-net","profinet"],"not_affected_if":["no-profinet-exposure","p-net-1.0.3-or-later"],"how_to_check":"- Check the P-Net version the device firmware is built on; the sources say versions before `1.0.3` are affected\n- Confirm whether the device is reachable from networks that send PROFINET read requests","fix":"- Move P-Net to `1.0.3` or later","status":"open","published_at":"2026-10-29T16:17:57+00:00","first_seen_at":"2026-10-29T16:25:56+00:00","triaged_at":"2026-10-29T16:29:25+00:00","updated_at":"2026-10-29T16:29:25+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-29T16:29:25Z","model":"claude-haiku-5-5","output":{"fix":"- Move P-Net to `1.0.3` or later","reach":"network","title":"P-Net: infinite loop on a PROFINET read request halts the device","impact":"low","summary":"P-Net, a PROFINET device stack, loops forever when it handles a read request for the PDPortDataCheck record on subslot 0 (the whole module). The device stops responding, so an unauthenticated remote attacker can cause a denial of service.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["profinet","p-net","industrial-control","embedded"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"device stops responding until it is restarted or reset","analyst_note":"Sources do not say which vendor products embed P-Net or whether a restart recovers the device; check the NVD entry and the P-Net 1.0.3 release notes.","how_to_check":"- Check the P-Net version the device firmware is built on; the sources say versions before `1.0.3` are affected\n- Confirm whether the device is reachable from networks that send PROFINET read requests","plain_action":"","needs_analyst":true,"not_affected_if":["p-net-1.0.3-or-later","no-profinet-exposure"],"who_is_affected":"Industrial or automation devices built on P-Net before 1.0.3 that accept PROFINET read requests on the network. Systems where PROFINET traffic is kept off untrusted networks are less exposed; the sources do not say more.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000688,"input_tokens":4134,"output_tokens":550,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-111731':16A,19A '-2026':15A,18A '0':50B,89C '1.0.3':73C 'advanc':98C 'attack':62B,116C 'caus':64B,121C 'complet':107C 'control':23B 'cve':14A,17A 'denial':66B,123C 'devic':13A,34B,55B,110C 'embed':20B 'enter':74C 'forev':37B 'halt':11A 'handl':40B,79C 'industri':22B 'industrial-control':21B 'infinit':4A,76C 'infrastructur':24B 'loop':5A,36B,77C,93C 'modul':53B,91C 'net':3A,27B,31B,71C 'never':97C,106C 'next':101C 'p':2A,26B,30B,70C 'p-net':1A,25B,29B,69C 'pdportdatacheck':46B,85C 'port':96C,102C 'profinet':8A,28B,33B 'read':9A,42B,81C 'record':47B,86C 'remot':61B,114C 'request':10A,43B,82C,105C 'respond':57B,112C 'servic':68B,125C 'stack':35B 'stop':56B,111C 'subslot':49B,88C 'unauthent':60B,115C 'use':118C 'whole':52B,90C","nicknames":[],"mitigations":[],"who_affected":"Industrial or automation devices built on P-Net before 1.0.3 that accept PROFINET read requests on the network. Systems where PROFINET traffic is kept off untrusted networks are less exposed; the sources do not say more.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"first_public_at":"2026-10-29T16:17:57+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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":"4b71179a-3b92-4a9d-b9fc-af8b8ed579ee","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-111731","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111731","severity":null,"published_at":"2026-10-29T16:17:57+00:00","modified_at":"2026-10-29T16:17:57+00:00","first_seen_at":"2026-10-29T16:25:56+00:00","fetched_at":"2026-10-29T16:25:56+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"}