{"id":"CVE-2026-76955","kind":"vulnerability","aliases":["CVE-2026-76955"],"related":[],"title":"Zyxel NWA110AX access point: buffer overflow lets LAN attacker escalate privileges","description":"A buffer overflow vulnerability in the zdp_wtp binary in Zyxel NWA110AX firmware versions through 7.12(ABTG.0)C0 could allow a LAN-based attacker to escalate privileges on an affected device.","summary":"The zdp_wtp binary in Zyxel NWA110AX firmware through 7.12(ABTG.0)C0 has a buffer overflow. A LAN-based attacker can use it to escalate privileges on the device.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"NWA110AX","fixed":["7.12(ABTG.1)C0"],"affected":"<= 7.12(ABTG.0)C0","ecosystem":"vendor"}],"ecosystems":[],"tags":["firmware","infrastructure","lan-adjacent","nwa110ax","wifi-access-point","zyxel"],"not_affected_if":["isolated-network","newer-firmware"],"how_to_check":"Check the firmware version in the NWA110AX web admin page or CLI. 7.12(ABTG.0)C0 or earlier is vulnerable; 7.12(ABTG.1)C0 is the patched build. Also check other Zyxel APs, FWA7 and USG LITE 60AX against the model table in the advisory; those are affected too.","fix":"Update NWA110AX firmware to 7.12(ABTG.1)C0 (Zyxel advisory, 2026-11-03).","status":"open","published_at":"2026-11-03T02:16:53+00:00","first_seen_at":"2026-11-03T02:47:45+00:00","triaged_at":"2026-11-03T02:48:56+00:00","updated_at":"2026-11-03T02:51:34+00:00","category":"infrastructure","confidence":0.85,"triage":{"at":"2026-11-03T02:48:56Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Zyxel NWA110AX access point: buffer overflow lets LAN attacker escalate privileges","impact":"high","summary":"The zdp_wtp binary in Zyxel NWA110AX firmware through 7.12(ABTG.0)C0 has a buffer overflow. A LAN-based attacker can use it to escalate privileges on the device.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["zyxel","nwa110ax","wifi-access-point","firmware"],"confidence":0.6,"fix_status":"unknown","needs_auth":"unknown","worst_case":"LAN attacker gains elevated privileges on the access point","analyst_note":"Find the fixed firmware version and vendor advisory for NWA110AX; the NVD entry does not name one. Confirm whether authentication is needed.","how_to_check":"- Check the firmware version on the NWA110AX web admin page or CLI and compare it with `7.12(ABTG.0)C0`\n- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["newer-firmware","isolated-network"],"who_is_affected":"Affects Zyxel NWA110AX access points running firmware through 7.12(ABTG.0)C0. Exposure requires an attacker already on the local network. Devices on isolated networks or running a newer firmware the sources do not name are less exposed; the sources do not say which newer versions are fixed.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000686,"input_tokens":4124,"output_tokens":547,"severity_before":"high"},"analyst_status":"done","analyst_note":"Find the fixed firmware version and vendor advisory for NWA110AX; the NVD entry does not name one. Confirm whether authentication is needed.","search":"'-2026':13A,16A '-76955':14A,17A '7.12':39B,75C 'abtg.0':40B,76C 'access':3A,27B 'adjac':23B 'affect':90C 'allow':79C 'attack':9A,50B,84C 'base':49B,83C 'binari':33B,68C 'buffer':5A,44B,61C 'c0':41B,77C 'could':78C 'cve':12A,15A 'devic':59B,91C 'escal':10A,55B,86C 'firmwar':19B,37B,72C 'infrastructur':20B 'lan':8A,22B,48B,82C 'lan-adjac':21B 'lan-bas':47B,81C 'let':7A 'nwa110ax':2A,18A,24B,36B,71C 'overflow':6A,45B,62C 'point':4A,28B 'privileg':11A,56B,87C 'use':52B 'version':73C 'vulner':63C 'wifi':26B 'wifi-access-point':25B 'wtp':32B,67C 'zdp':31B,66C 'zyxel':1A,29B,35B,70C","nicknames":[],"mitigations":[],"who_affected":"Zyxel says the zdp_wtp binary in many Zyxel access points (including NWA110AX up to 7.12(ABTG.0)C0), FWA7 devices and USG LITE 60AX has a buffer overflow that lets a LAN-based attacker escalate privileges. Look at any site running these models where untrusted devices or users share the local network. Zyxel says on-market products not listed in its table are not affected. The advisory does not say whether authentication is needed.","tier":"B","verified":{"fix":{"at":"2026-11-03T02:51:34Z","by":"analyst","doc":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerability-in-certain-aps-fwa7-and-security-routers-11-03-2026","run_id":1447},"products":{"at":"2026-11-03T02:51:34Z","by":"analyst","doc":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerability-in-certain-aps-fwa7-and-security-routers-11-03-2026","run_id":1447},"how_to_check":{"at":"2026-11-03T02:51:34Z","by":"analyst","doc":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerability-in-certain-aps-fwa7-and-security-routers-11-03-2026","run_id":1447},"who_affected":{"at":"2026-11-03T02:51:34Z","by":"analyst","doc":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerability-in-certain-aps-fwa7-and-security-routers-11-03-2026","run_id":1447}},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":["nwa110ax"],"ptokens":["nwa110ax"],"labels":["firmware","high","infrastructure","lanadjacent","nwa110ax","wifiaccesspoint","zyxel"],"first_public_at":"2026-11-03T02:16:53+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"security@zyxel.com.tw","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-76955","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76955","severity":null,"published_at":"2026-11-03T02:16:53+00:00","modified_at":"2026-11-03T02:16:53+00:00","first_seen_at":"2026-11-03T02:47:45+00:00","fetched_at":"2026-11-03T02:47:45+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-76955:1447","url":null,"severity":null,"published_at":"2026-11-03T02:51:34+00:00","modified_at":"2026-11-03T02:51:34+00:00","first_seen_at":"2026-11-03T02:51:34+00:00","fetched_at":"2026-11-03T02:51:34+00:00","note":"Read Zyxel advisory (11-03-2026): fix 7.12(ABTG.1)C0 for NWA110AX. Auth requirement not stated by vendor; not verified (third-party NVD vector says AV:A/PR:N). No exploitation/PoC found. Did not check X."}],"documents":[{"id":55139,"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerability-in-certain-aps-fwa7-and-security-routers-11-03-2026","title":"Zyxel security advisory for buffer overflow vulnerability in certain APs, FWA7, and Security Routers","kind":"advisory","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}