{"id":"CVE-2026-122118","kind":"vulnerability","aliases":["CVE-2026-122118"],"related":[],"title":"Yealink devices: default 8-digit Wi-Fi key lets attackers brute-force network access","description":"In certain Yealink products before 2026-04-15, when the Wi-Fi AP function is enabled, a default 8-digit numeric PSK with insufficient strength is used. Attackers can exploit this weakness via brute-force attacks to gain unauthorized network access and intercept Wi-Fi traffic.","summary":"Certain Yealink products ship with a default 8-digit numeric pre-shared key for their Wi-Fi access point mode, which is too weak to resist brute-force guessing. An attacker who guesses it can join the network and intercept Wi-Fi traffic.","severity":"high","cvss":7.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","voip-phones","wifi","yealink"],"not_affected_if":["custom-psk","wifi-ap-disabled"],"how_to_check":"- Check whether the Wi-Fi AP function is enabled on each Yealink device.\n- Check whether the Wi-Fi pre-shared key is still the default 8-digit numeric value; the affected product models and firmware are unknown from the sources.\n- Confirm the device firmware date against `2026-04-15`.","fix":"- Products before 2026-04-15 are affected; the fixed firmware version is unknown from the sources.","status":"open","published_at":"2026-11-04T18:17:43+00:00","first_seen_at":"2026-11-04T18:28:34+00:00","triaged_at":"2026-11-04T18:29:37+00:00","updated_at":"2026-11-04T18:29:37+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-04T18:29:37Z","model":"claude-haiku-5-5","output":{"fix":"- Products before 2026-04-15 are affected; the fixed firmware version is unknown from the sources.","reach":"network","title":"Yealink devices: default 8-digit Wi-Fi key lets attackers brute-force network access","impact":"high","summary":"Certain Yealink products ship with a default 8-digit numeric pre-shared key for their Wi-Fi access point mode, which is too weak to resist brute-force guessing. An attacker who guesses it can join the network and intercept Wi-Fi traffic.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["yealink","wifi","voip-phones"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker joins the network and intercepts Wi-Fi traffic.","analyst_note":"Find the affected Yealink models, firmware versions, and fixed release from the vendor advisory; the NVD entry alone does not name them.","how_to_check":"- Check whether the Wi-Fi AP function is enabled on each Yealink device.\n- Check whether the Wi-Fi pre-shared key is still the default 8-digit numeric value; the affected product models and firmware are unknown from the sources.\n- Confirm the device firmware date against `2026-04-15`.","plain_action":"","needs_analyst":true,"not_affected_if":["wifi-ap-disabled","custom-psk"],"who_is_affected":"Only Yealink products with the Wi-Fi access point function enabled and a default 8-digit numeric pre-shared key are described as affected. Devices with the access point function off, or with a changed key, are not exposed by this weakness. The specific models are unknown from the sources.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000725,"input_tokens":4137,"output_tokens":622,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-04':82C '-122118':19A,22A '-15':83C '-2026':18A,21A '2026':81C '8':4A,36B,95C 'access':16A,48B,118C 'ap':89C 'attack':11A,62B,104C,113C 'brute':13A,58B,111C 'brute-forc':12A,57B,110C 'certain':29B,77C 'cve':17A,20A 'default':3A,35B,94C 'devic':2A 'digit':5A,37B,96C 'enabl':92C 'exploit':106C 'fi':8A,47B,74B,88C,123C 'forc':14A,59B,112C 'function':90C 'gain':115C 'guess':60B,64B 'infrastructur':23B 'insuffici':100C 'intercept':71B,120C 'join':67B 'key':9A,42B 'let':10A 'mode':50B 'network':15A,69B,117C 'numer':38B,97C 'phone':26B 'point':49B 'pre':40B 'pre-shar':39B 'product':31B,79C 'psk':98C 'resist':56B 'share':41B 'ship':32B 'strength':101C 'traffic':75B,124C 'unauthor':116C 'use':103C 'via':109C 'voip':25B 'voip-phon':24B 'weak':54B,108C 'wi':7A,46B,73B,87C,122C 'wi-fi':6A,45B,72B,86C,121C 'wifi':27B 'yealink':1A,28B,30B,78C","nicknames":[],"mitigations":[],"who_affected":"Only Yealink products with the Wi-Fi access point function enabled and a default 8-digit numeric pre-shared key are described as affected. Devices with the access point function off, or with a changed key, are not exposed by this weakness. The specific models are unknown from the sources.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","voipphones","wifi","yealink"],"campaign_type":null,"first_public_at":"2026-11-04T18:17:43+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","cvss_by":"cve@mitre.org","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-122118","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122118","severity":null,"published_at":"2026-11-04T18:17:43+00:00","modified_at":"2026-11-04T18:17:43+00:00","first_seen_at":"2026-11-04T18:28:34+00:00","fetched_at":"2026-11-04T18:28:34+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"}