{"cve":"CVE-2021-35029","nvd":{"published":"2021-07-02T11:15:08.930","modified":"2026-06-17T03:56:58.473","status":"Modified","description":"An authentication bypasss vulnerability in the web-based management interface of Zyxel USG/Zywall series firmware versions 4.35 through 4.64 and USG Flex, ATP, and VPN series firmware versions 4.35 through 5.01, which could allow a remote attacker to execute arbitrary commands on an affected device.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-287"],"references":["https://www.zyxel.com/support/Zyxel_security_advisory_for_attacks_against_security_appliances.shtml","https://www.zyxel.com/support/Zyxel_security_advisory_for_attacks_against_security_appliances.shtml"],"products":["zyxel:usg1000_firmware","zyxel:usg100_firmware","zyxel:usg1100_firmware","zyxel:usg110_firmware","zyxel:usg1900_firmware","zyxel:usg20-vpn_firmware","zyxel:usg2000_firmware","zyxel:usg200_firmware","zyxel:usg20_firmware","zyxel:usg20w-vpn_firmware","zyxel:usg20w_firmware","zyxel:usg210_firmware","zyxel:usg2200-vpn_firmware","zyxel:usg300_firmware","zyxel:usg310_firmware","zyxel:usg40_firmware","zyxel:usg40w_firmware","zyxel:usg50_firmware","zyxel:usg60_firmware","zyxel:usg60w_firmware","zyxel:usg_flex_100_firmware","zyxel:usg_flex_100w_firmware","zyxel:usg_flex_200_firmware","zyxel:usg_flex_500_firmware","zyxel:usg_flex_700_firmware","zyxel:zywall_1100_firmware","zyxel:zywall_110_firmware","zyxel:zywall_310_firmware","zyxel:zywall_atp100_firmware","zyxel:zywall_atp100w_firmware","zyxel:zywall_atp200_firmware","zyxel:zywall_atp500_firmware","zyxel:zywall_atp700_firmware","zyxel:zywall_atp800_firmware","zyxel:zywall_vpn100_firmware","zyxel:zywall_vpn300_firmware","zyxel:zywall_vpn50_firmware"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2021-35029","score":0.02255,"percentile":0.82947,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}