{"cve_id":"CVE-2021-33045","published":"2021-09-15T22:15:10.687000+00:00","last_modified":"2026-06-17T03:54:04.020000+00:00","vuln_status":"Analyzed","description":"The identity authentication bypass vulnerability found in some Dahua products during the login process. Attackers can bypass device identity authentication by constructing malicious data packets.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","base_score":9.8,"base_severity":"CRITICAL","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-287"],"in_kev":true,"kev_date_added":"2024-08-21","kev_ransomware":false,"epss_score":0.99593,"epss_percentile":0.99947,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["AUTH_BYPASS","CODE_EXEC"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T09:49:31.857362+00:00","first_seen":"2021-09-15T22:15:10.687000+00:00","kev_first_seen":"2024-08-21T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["dahuasecurity"],"products":["ipc-hum7xxx","ipc-hum7xxx_firmware","ipc-hx3xxx","ipc-hx3xxx_firmware","ipc-hx5xxx","ipc-hx5xxx_firmware","nvr-1xxx","nvr-1xxx_firmware","nvr-2xxx","nvr-2xxx_firmware","nvr-4xxx","nvr-4xxx_firmware","nvr-5xxx","nvr-5xxx_firmware","nvr-6xx","nvr-6xx_firmware","vth-542xh","vth-542xh_firmware","vto-65xxx","vto-65xxx_firmware","vto-75x95x","vto-75x95x_firmware","xvr-4x04","xvr-4x04_firmware","xvr-4x08","xvr-4x08_firmware","xvr-5x04","xvr-5x04_firmware","xvr-5x08","xvr-5x08_firmware","xvr-5x16","xvr-5x16_firmware","xvr-7x16","xvr-7x16_firmware","xvr-7x32","xvr-7x32_firmware"],"affected":[{"vendor":"dahuasecurity","product":"ipc-hum7xxx_firmware","ranges":["< 2.820.0000000.5.r.210705"]},{"vendor":"dahuasecurity","product":"ipc-hx3xxx_firmware","ranges":["< 2.800.0000000.29.r.210630"]},{"vendor":"dahuasecurity","product":"ipc-hx5xxx_firmware","ranges":["< 2.820.0000000.5.r.210705"]},{"vendor":"dahuasecurity","product":"nvr-1xxx_firmware","ranges":["< 4.001.0000005.1.r.210709"]},{"vendor":"dahuasecurity","product":"nvr-2xxx_firmware","ranges":["< 4.001.0000000.1.r.210710"]},{"vendor":"dahuasecurity","product":"nvr-4xxx_firmware","ranges":["< 4.001.0000005.1.r.210713"]},{"vendor":"dahuasecurity","product":"nvr-5xxx_firmware","ranges":["< 4.001.0000000.0.r.210710"]},{"vendor":"dahuasecurity","product":"nvr-6xx_firmware","ranges":["< 4.001.0000001.1.r.210716"]},{"vendor":"dahuasecurity","product":"vth-542xh_firmware","ranges":["< 4.500.0000002.0.r.210715"]},{"vendor":"dahuasecurity","product":"vto-65xxx_firmware","ranges":["< 4.300.0000004.0.r.210715"]},{"vendor":"dahuasecurity","product":"vto-75x95x_firmware","ranges":["< 4.300.0000003.0.r.210714"]},{"vendor":"dahuasecurity","product":"xvr-4x04_firmware","ranges":["all versions","< 4.001.0000001.1.r.210709"]},{"vendor":"dahuasecurity","product":"xvr-4x08_firmware","ranges":["< 4.001.0000001.1.r.210709"]},{"vendor":"dahuasecurity","product":"xvr-5x04_firmware","ranges":["< 4.001.0000003.1.r.210710"]},{"vendor":"dahuasecurity","product":"xvr-5x08_firmware","ranges":["< 4.001.0000003.1.r.210710"]},{"vendor":"dahuasecurity","product":"xvr-5x16_firmware","ranges":["< 4.001.0000003.1.r.210710"]},{"vendor":"dahuasecurity","product":"xvr-7x16_firmware","ranges":["< 4.001.0000003.1.r.210710"]},{"vendor":"dahuasecurity","product":"xvr-7x32_firmware","ranges":["< 4.001.0000003.1.r.210710"]}]}