# CVE-2021-33046: Auth bypass in Access control vulnerability found in some Dahua products

> Attackers can reset device passwords in specific Dahua deployments, leading to unauthorized access and account takeover.

- **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:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jan 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-6v9x-wm34-846q

## What is CVE-2021-33046?

CVE-2021-33046 is a critical authentication bypass vulnerability in Access control vulnerability found in some Dahua products, published on 13 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Some Dahua products have access control vulnerability in the password reset process. Attackers can exploit this vulnerability through specific deployments to reset device passwords.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2021-33046?

It affects 28 products.


Products: Dahuasecurity Asc2204c Firmware, Dahuasecurity Hcvr7xxx Firmware, Dahuasecurity Hcvr8xxx Firmware, Dahuasecurity Ipc-Hx1xxx Firmware, Dahuasecurity Ipc-Hx2xxx Firmware, Dahuasecurity Ipc-Hx3xxx Firmware, Dahuasecurity Ipc-Hx5\(4\)\(3\)xxx Firmware, Dahuasecurity Ipc-Hx5xxx Firmware, Dahuasecurity Nvr1xxx Firmware, Dahuasecurity Nvr2xxx Firmware, Dahuasecurity Nvr4xxx Firmware, Dahuasecurity Nvr5xxx Firmware, Dahuasecurity Sd1a1 Firmware, Dahuasecurity Sd22 Firmware, Dahuasecurity Sd49 Firmware, Dahuasecurity Sd50 Firmware, Dahuasecurity Sd52c Firmware, Dahuasecurity Sd6al Firmware, Dahuasecurity Tpc-Bf1241 Firmware, Dahuasecurity Tpc-Bf2221 Firmware and 8 more.

## How do I fix CVE-2021-33046?

No fix has been published for CVE-2021-33046 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33046 being exploited?

There is no known exploitation of CVE-2021-33046 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33046 and fix it if it is affected.

What it is: CVE-2021-33046 is a critical authentication bypass vulnerability in Access control vulnerability found in some Dahua products, published on 13 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-33046 in the wild and no public exploit code.

Affected product: Access control vulnerability found in some Dahua products. 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-2021-33046/ (Markdown: https://insights.sbomify.com/CVE-2021-33046/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33046
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33046
- OSV: https://osv.dev/vulnerability/CVE-2021-33046

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33046/
Summaries are generated and may contain mistakes; the official description above is the record.