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

> Attackers can bypass identity authentication on Dahua IP cameras, intercoms, and recorders by sending malicious data packets.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 21 Aug 2024 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Sep 2021
- **Updated:** 12 Jan 2026
- **Also known as:** GHSA-9vwj-hj2h-whjq

## What is CVE-2021-33045?

CVE-2021-33045 is a critical authentication bypass vulnerability in Some Dahua IP Camera, Video Intercom, NVR, XVR devices, published on 15 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2021-33045?

It affects 18 products.


Products: Dahuasecurity Ipc-Hum7xxx Firmware, Dahuasecurity Ipc-Hx3xxx Firmware, Dahuasecurity Ipc-Hx5xxx Firmware, Dahuasecurity Nvr-1xxx Firmware, Dahuasecurity Nvr-2xxx Firmware, Dahuasecurity Nvr-4xxx Firmware, Dahuasecurity Nvr-5xxx Firmware, Dahuasecurity Nvr-6xx Firmware, Dahuasecurity Vth-542xh Firmware, Dahuasecurity Vto-65xxx Firmware, Dahuasecurity Vto-75x95x Firmware, Dahuasecurity Xvr-4x04 Firmware, Dahuasecurity Xvr-4x08 Firmware, Dahuasecurity Xvr-5x04 Firmware, Dahuasecurity Xvr-5x08 Firmware, Dahuasecurity Xvr-5x16 Firmware, Dahuasecurity Xvr-7x16 Firmware, Dahuasecurity Xvr-7x32 Firmware.

## How do I fix CVE-2021-33045?

No fix has been published for CVE-2021-33045 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 11 Sep 2024.

## Is CVE-2021-33045 being exploited?

Yes. Attackers have exploited CVE-2021-33045 in the wild since at least 21 Aug 2024.

Public exploit code:

- https://github.com/dongpohezui/cve-2021-33045 (github_poc): https://github.com/dongpohezui/cve-2021-33045
- Dahua IPC/VTH/VTO - Authentication Bypass (nuclei): http/cves/2021/CVE-2021-33045.yaml

## Other vulnerabilities in Some Dahua IP Camera, Video Intercom, NVR, XVR devices

- [CVE-2021-33044](https://insights.sbomify.com/CVE-2021-33044/): Dahua IP Camera Authentication Bypass (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33045 and fix it if it is affected.

What it is: CVE-2021-33045 is a critical authentication bypass vulnerability in Some Dahua IP Camera, Video Intercom, NVR, XVR devices, published on 15 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2021-33045 in the wild since at least 21 Aug 2024.

Affected product: Some Dahua IP Camera, Video Intercom, NVR, XVR devices. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-33045/ (Markdown: https://insights.sbomify.com/CVE-2021-33045/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33045
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33045
- OSV: https://osv.dev/vulnerability/CVE-2021-33045

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33045/
Summaries are generated and may contain mistakes; the official description above is the record.