CVE-2021-33045: Dahua IP Camera Authentication Bypass Vulnerability

CISA Known Exploited Vulnerabilities

Name

Dahua IP Camera Authentication Bypass Vulnerability

Vendor

Dahua

Product

IP Camera Firmware

Added to the catalog

2024-08-21

Due date for US federal agencies

2024-09-11

Weaknesses

CWE-287

Catalog version

2026.10.30

Dahua IP cameras and related products contain an authentication bypass vulnerability when the loopback device is specified by the client during authentication.

Required action (CISA)

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://www.dahuasecurity.com/aboutUs/trustedCenter/details/582
• https://nvd.nist.gov/vuln/detail/CVE-2021-33045

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2021-09-15T22:15:10.687

Last modified

2026-06-17T03:54:04.020

Weaknesses

CWE-287

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.

References

• http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html (Exploit, Third Party Advisory, VDB Entry)
• http://seclists.org/fulldisclosure/2021/Oct/13 (Exploit, Mailing List, Third Party Advisory)
• https://www.dahuasecurity.com/support/cybersecurity/details/957 (Vendor Advisory)
• http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html (Exploit, Third Party Advisory, VDB Entry)
• http://seclists.org/fulldisclosure/2021/Oct/13 (Exploit, Mailing List, Third Party Advisory)
• https://www.dahuasecurity.com/support/cybersecurity/details/957 (Vendor Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33045 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:59.479Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-33045

CVE record

Assigner

dahua

State

PUBLISHED

Published

2021-09-15T21:50:08.000Z

Updated

2026-01-12T19:53:51.321Z

Problem types

Improper Authentication

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.

References

• https://www.dahuasecurity.com/support/cybersecurity/details/957
• 20211005 [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045)
• http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html

Read on 2026-11-03T01:08:04.331Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2021/33xxx/CVE-2021-33045.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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