{"id":"CVE-2022-0910","aliases":["EUVD-2022-15940","GHSA-mv2h-6cx9-44g2"],"status":"published","title":"A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI...","description":"A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0074,"percentile":0.54873,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2022-05-24T02:20:13Z","modified":"2026-06-17T04:21:28Z","products":[{"vendor":"zyxel","product":"atp series firmware"},{"vendor":"zyxel","product":"atp100_firmware"},{"vendor":"zyxel","product":"atp100w_firmware"},{"vendor":"zyxel","product":"atp200_firmware"},{"vendor":"zyxel","product":"atp500_firmware"},{"vendor":"zyxel","product":"atp700_firmware"},{"vendor":"zyxel","product":"atp800_firmware"},{"vendor":"zyxel","product":"usg flex series firmware"},{"vendor":"zyxel","product":"usg/zywall series firmware"},{"vendor":"zyxel","product":"usg200_firmware"},{"vendor":"zyxel","product":"usg20_firmware"},{"vendor":"zyxel","product":"usg210_firmware"},{"vendor":"zyxel","product":"usg2200_firmware"},{"vendor":"zyxel","product":"usg300_firmware"},{"vendor":"zyxel","product":"usg310_firmware"},{"vendor":"zyxel","product":"usg_1100_firmware"},{"vendor":"zyxel","product":"usg_110_firmware"},{"vendor":"zyxel","product":"usg_1900_firmware"},{"vendor":"zyxel","product":"usg_20w-vpn_firmware"},{"vendor":"zyxel","product":"usg_20w_firmware"},{"vendor":"zyxel","product":"usg_2200-vpn_firmware"},{"vendor":"zyxel","product":"usg_310_firmware"},{"vendor":"zyxel","product":"usg_40_firmware"},{"vendor":"zyxel","product":"usg_40w_firmware"},{"vendor":"zyxel","product":"usg_60_firmware"},{"vendor":"zyxel","product":"usg_60w_firmware"},{"vendor":"zyxel","product":"usg_flex_100_firmware"},{"vendor":"zyxel","product":"usg_flex_100w_firmware"},{"vendor":"zyxel","product":"usg_flex_200_firmware"},{"vendor":"zyxel","product":"usg_flex_500_firmware"},{"vendor":"zyxel","product":"usg_flex_700_firmware"},{"vendor":"zyxel","product":"vpn series firmware"},{"vendor":"zyxel","product":"vpn1000_firmware"},{"vendor":"zyxel","product":"vpn100_firmware"},{"vendor":"zyxel","product":"vpn300_firmware"},{"vendor":"zyxel","product":"vpn50_firmware"}],"references":[{"url":"https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-0910"},{"url":"https://github.com/advisories/GHSA-mv2h-6cx9-44g2"}],"sources":{"cve":[{"id":"CVE-2022-0910","description":"A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled.","status":"published","published":"2022-05-24T02:20:13Z","modified":"2024-08-02T23:47:42.905Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:34:41.69911Z"}],"euvd":[{"id":"EUVD-2022-15940","description":"A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled.","status":"published","published":"2022-05-24T02:20:13Z","modified":"2024-08-02T23:47:42Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T03:26:03.022972Z"}],"ghsa":[{"id":"GHSA-mv2h-6cx9-44g2","title":"A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI...","description":"A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled.","status":"published","published":"2022-05-25T00:00:41Z","modified":"2023-02-01T05:08:39Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:50:49.403077Z"}],"nvd":[{"id":"CVE-2022-0910","description":"A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled.","status":"published","published":"2022-05-24T03:15:09.15Z","modified":"2026-06-17T04:21:28.297Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:07:21.261605Z"}]}}