---
title: "CVE-2021-33044: Dahua IP Camera Authentication Bypass Vulnerability"
url: https://erroneo.us/security/cve/CVE-2021-33044/
description: "CVE-2021-33044 (Dahua IP Camera Firmware): Exploited in the wild (CISA KEV). The identity authentication bypass vulnerability found in some Dahua products…"
type: vulnerability-record
section: "Security Digest"
date_published: 2021-09-15
date_modified: 2026-01-12
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2021-33044"
kev: true
cvss: 9.8
epss: 0.99989
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2021-33044: Dahua IP Camera Authentication Bypass Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Dahua IP Camera Firmware. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-08-21, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-09-11 ; treat that as the outer limit, not the target.
- EPSS 100.0% , percentile 100.0: FIRST’s model estimates a 100.0% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- n/a Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal Camera devices: Dahua IP Camera devices IPC-HX3XXX, IPC-HX5XXX, and IPC-HUM7XXX, Video Intercom devices VTO75X95X, VTO65XXX, and VTH542XH, PTZ Dome Camera SD1A1, SD22, SD49, SD50, SD52C, and SD6AL, Thermal TPC-BF1241, TPC-BF2221, TPC-SD2221, TPC-BF5XXX, TPC-SD8X21, and TPC-PT8X21B devices Buildtime before June, 2021.

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2024-08-21; federal due date 2024-09-11. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 99.99% probability of exploitation activity in the next 30 days; percentile 100.0.

## Sources

- [Listed in CISA KEV notes (dahuasecurity.com)](https://www.dahuasecurity.com/aboutUs/trustedCenter/details/582)
- [CVE.org record CVE-2021-33044](https://www.cve.org/CVERecord?id=CVE-2021-33044)
- [NVD entry CVE-2021-33044](https://nvd.nist.gov/vuln/detail/CVE-2021-33044)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33044)
- [dahuasecurity.com](https://www.dahuasecurity.com/support/cybersecurity/details/957)
- [20211005 [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045)](http://seclists.org/fulldisclosure/2021/Oct/13)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html)

---
Source page: https://erroneo.us/security/cve/CVE-2021-33044/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt