{"id":"CVE-2026-109813","kind":"vulnerability","aliases":["CVE-2026-109813"],"related":[],"title":"Moxa industrial computers: hard-coded key in sysman lets attackers read traffic","description":"A hard-coded cryptographic key vulnerability exists in the `/usr/bin/sysman` of some of Moxa's industrial computing products. An unauthenticated attacker with adjacent network access could exploit the exposed private key material to compromise the confidentiality and integrity of communications.","summary":"Some Moxa industrial computers ship a hard-coded cryptographic private key in the /usr/bin/sysman binary. An attacker on an adjacent network can use that key to compromise the confidentiality and integrity of communications with the device.","severity":"high","cvss":8.6,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["industrial-computers","infrastructure","moxa","ot"],"not_affected_if":[],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-16T03:18:02+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","triaged_at":"2026-10-25T03:00:11+00:00","updated_at":"2026-10-25T03:00:11+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-10-25T03:00:11Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"Moxa industrial computers: hard-coded key in sysman lets attackers read traffic","impact":"medium","summary":"Some Moxa industrial computers ship a hard-coded cryptographic private key in the /usr/bin/sysman binary. An attacker on an adjacent network can use that key to compromise the confidentiality and integrity of communications with the device.","category":"infrastructure","nicknames":[],"who_cares":["moxa","industrial-computers","ot"],"confidence":0.5,"needs_auth":"no","worst_case":"attacker decrypts and tampers with device communications using exposed key","analyst_note":"Find Moxa's advisory for the affected models and fixed firmware versions; the NVD entry alone gives no versions or check steps.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Owners of Moxa industrial computing products that include /usr/bin/sysman. The sources do not list affected models or firmware versions, so the exact product set is unknown. Teams without Moxa industrial computers can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000545,"input_tokens":3320,"output_tokens":425,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-109813':16A,19A '-2026':15A,18A '/usr/bin/sysman':40B,73C 'access':88C 'adjac':46B,86C 'attack':11A,43B,84C 'binari':41B 'code':6A,34B,66C 'communic':59B,103C 'compromis':53B,97C 'comput':3A,22B,29B,80C 'confidenti':55B,99C 'could':89C 'cryptograph':35B,67C 'cve':14A,17A 'devic':62B 'exist':70C 'exploit':90C 'expos':92C 'hard':5A,33B,65C 'hard-cod':4A,32B,64C 'industri':2A,21B,28B,79C 'industrial-comput':20B 'infrastructur':23B 'integr':57B,101C 'key':7A,37B,51B,68C,94C 'let':10A 'materi':95C 'moxa':1A,24B,27B,77C 'network':47B,87C 'ot':25B 'privat':36B,93C 'product':81C 'read':12A 'ship':30B 'sysman':9A 'traffic':13A 'unauthent':83C 'use':49B 'vulner':69C","nicknames":[],"mitigations":[],"who_affected":"Owners of Moxa industrial computing products that include /usr/bin/sysman. The sources do not list affected models or firmware versions, so the exact product set is unknown. Teams without Moxa industrial computers can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T03:18:02+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/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":"psirt@moxa.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-109813","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109813","severity":null,"published_at":"2026-10-16T03:18:02+00:00","modified_at":"2026-10-16T19:56:15+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","fetched_at":"2026-10-23T22:28:54+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"}