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

Source: https://junglewise.ai/threats/cve-2021-33045-dahua-ip-camera-authentication-bypass-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-08-21. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2021-33045 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2024-08-21

An authentication bypass vulnerability exists in several Dahua IP cameras and NVR products during the login process. Attackers can bypass identity authentication by constructing malicious data packets, specifically when a loopback device is specified by the client during authentication.

Vendors: [Dahua](https://junglewise.ai/threats/vendors/dahua).

## Quick answers

**Is CVE-2021-33045 exploited in the wild?** Yes. CVE-2021-33045 is known to be exploited in the wild, first recorded on 21 August 2024. Treat it as urgent.

**How severe is CVE-2021-33045?** Critical severity, with a CVSS score of 9.8, published 21 August 2024.

**Which products and versions are affected?** Dahua IPC-HUM7XXX Firmware before 2.820.0000000.5.r.210705; Dahua IPC-HX3XXX Firmware before 2.800.0000000.29.r.210630; Dahua IPC-HX5XXX Firmware before 2.820.0000000.5.r.210705; Dahua NVR-1XXX Firmware before 4.001.0000005.1.r.210709; and 3 more.

**Is there a fix for CVE-2021-33045?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2021-33045 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2021-33045?** Check whether you run Dahua IP Camera Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Dahua IPC-HUM7XXX Firmware before 2.820.0000000.5.r.210705
- Dahua IPC-HX3XXX Firmware before 2.800.0000000.29.r.210630
- Dahua IPC-HX5XXX Firmware before 2.820.0000000.5.r.210705
- Dahua NVR-1XXX Firmware before 4.001.0000005.1.r.210709
- Dahua NVR-2XXX Firmware before 4.001.0000000.1.r.210710
- Dahua NVR-4XXX Firmware before 4.001.0000005.1.r.210713
- Dahua NVR-5XXX Firmware before 4.001.0000000.0.r.210710

## Timeline

- 2021-09-30: disclosed: Initial NVD analysis and vendor advisory published
- 2024-08-21: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2024-08-21: exploited: Confirmed exploited in the wild per CISA KEV catalog

## Related threats

- [Dahua IP Camera Authentication Bypass Vulnerability](https://junglewise.ai/threats/cve-2021-33044-dahua-ip-camera-authentication-bypass-vulnerability)