{"id":"CVE-2021-33539","aliases":["EUVD-2021-20231","GHSA-9vqf-5jhj-hm4w"],"status":"published","title":"WEIDMUELLER: WLAN devices affected by authentication bypass vulnerability","description":"In Weidmueller Industrial WLAN devices in multiple versions an exploitable authentication bypass vulnerability exists in the hostname processing. A specially configured device hostname can cause the device to interpret selected remote traffic as local traffic, resulting in a bypass of web authentication. An attacker can send authenticated SNMP requests to trigger this vulnerability.","severity":{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01058,"percentile":0.64718,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2021-06-25T18:26:03Z","modified":"2026-06-17T03:54:45Z","products":[{"vendor":"weidmueller","product":"ie-wl-bl-ap-cl-eu_firmware"},{"vendor":"weidmueller","product":"ie-wl-bl-ap-cl-us_firmware"},{"vendor":"weidmueller","product":"ie-wl-vl-ap-br-cl-eu_firmware"},{"vendor":"weidmueller","product":"ie-wl-vl-ap-br-cl-us_firmware"},{"vendor":"weidmueller","product":"ie-wlt-bl-ap-cl-eu_firmware"},{"vendor":"weidmueller","product":"ie-wlt-bl-ap-cl-us_firmware"},{"vendor":"weidmueller","product":"ie-wlt-vl-ap-br-cl-eu_firmware"},{"vendor":"weidmueller","product":"ie-wlt-vl-ap-br-cl-us_firmware"},{"vendor":"weidmüller","product":"ie-wl(t)-bl-ap-cl-xx"},{"vendor":"weidmüller","product":"ie-wl(t)-vl-ap-cl-xx"}],"references":[{"url":"https://cert.vde.com/en-us/advisories/vde-2021-026","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33539"},{"url":"https://github.com/advisories/GHSA-9vqf-5jhj-hm4w"}],"sources":{"cve":[{"id":"CVE-2021-33539","title":"WEIDMUELLER: WLAN devices affected by authentication bypass vulnerability","description":"In Weidmueller Industrial WLAN devices in multiple versions an exploitable authentication bypass vulnerability exists in the hostname processing. A specially configured device hostname can cause the device to interpret selected remote traffic as local traffic, resulting in a bypass of web authentication. An attacker can send authenticated SNMP requests to trigger this vulnerability.","status":"published","published":"2021-06-25T18:26:03.815Z","modified":"2024-09-16T17:43:21.621Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:33:10.555814Z"}],"euvd":[{"id":"EUVD-2021-20231","description":"In Weidmueller Industrial WLAN devices in multiple versions an exploitable authentication bypass vulnerability exists in the hostname processing. A specially configured device hostname can cause the device to interpret selected remote traffic as local traffic, resulting in a bypass of web authentication. An attacker can send authenticated SNMP requests to trigger this vulnerability.","status":"published","published":"2021-06-25T18:26:03Z","modified":"2024-09-16T17:43:21Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:55:39.660997Z"}],"ghsa":[{"id":"GHSA-9vqf-5jhj-hm4w","title":"In Weidmueller Industrial WLAN devices in multiple versions an exploitable authentication bypass...","description":"In Weidmueller Industrial WLAN devices in multiple versions an exploitable authentication bypass vulnerability exists in the hostname processing. A specially configured device hostname can cause the device to interpret selected remote traffic as local traffic, resulting in a bypass of web authentication. An attacker can send authenticated SNMP requests to trigger this vulnerability.","status":"published","published":"2022-05-24T19:06:16Z","modified":"2023-01-30T05:00:30Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:46:13.0899Z"}],"nvd":[{"id":"CVE-2021-33539","description":"In Weidmueller Industrial WLAN devices in multiple versions an exploitable authentication bypass vulnerability exists in the hostname processing. A specially configured device hostname can cause the device to interpret selected remote traffic as local traffic, resulting in a bypass of web authentication. An attacker can send authenticated SNMP requests to trigger this vulnerability.","status":"published","published":"2021-06-25T19:15:09.633Z","modified":"2026-06-17T03:54:45.063Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:06:55.259633Z"}]}}