# CVE-2021-33044 — Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal Camera devices

**CISA KEV**

> As of 2026-01-12, CVE-2021-33044 is a CRITICAL-severity vulnerability in Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal Camera devices, CVSS v3.1 9.8, EPSS 99.9% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-08-21), with a US federal remediation deadline of 2024-09-11. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2021-33044, most recently “CERT-UA warns of active exploitation of Dahua cameras and recorders via Easy4IP and CVE-2021-33044/CVE-2021-33045 (Operation CameraSwarm)”.

**Last updated:** 2026-01-12

## What is CVE-2021-33044?

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.

The record classifies CVE-2021-33044 under weakness class [CWE-287](https://intel.threadlinqs.com/cwe/CWE-287). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 1868 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 99.9% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
- **CISA KEV:** Listed since 2024-08-21, federal remediation deadline 2024-09-11
- **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- **Published:** 2021-09-15, last modified 2026-01-12

## Is CVE-2021-33044 being exploited?

CISA added CVE-2021-33044 to the Known Exploited Vulnerabilities catalog on 2024-08-21, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2024-09-11 under BOD 22-01. Weaponised exploit code for CVE-2021-33044 is publicly available. 8 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (`http/cves/2021/CVE-2021-33044.yaml`). It currently carries a trending score of 55 in the Threadlinqs vulnerability feed.

- [bp2008/DahuaLoginBypass](https://github.com/bp2008/DahuaLoginBypass) (github)
- [umair-aziz025/dahua-cve-research](https://github.com/umair-aziz025/dahua-cve-research) (github)
- [Spy0x7/CVE-2021-33044](https://github.com/Spy0x7/CVE-2021-33044) (github)
- [haingn/LoHongCam-CVE-2021-33044](https://github.com/haingn/LoHongCam-CVE-2021-33044) (github)
- [Baza-NATO/CVE-2021-33044](https://github.com/Baza-NATO/CVE-2021-33044) (github)
- [eagle-nett/DAHUA_AUTH-BYPASS-CVE-2021-33044](https://github.com/eagle-nett/DAHUA_AUTH-BYPASS-CVE-2021-33044) (github)
- [litndat/Camera-Dahua-Research-l-h-ng-CVE-2021-33044](https://github.com/litndat/Camera-Dahua-Research-l-h-ng-CVE-2021-33044) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2021/CVE-2021-33044.md) (trickest)

## Affected products and versions

- **(vendor unspecified)**: Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal Camera devices

## How to fix CVE-2021-33044

Vendor advisory: [https://www.dahuasecurity.com/support/cybersecurity/details/957](https://www.dahuasecurity.com/support/cybersecurity/details/957). Because CVE-2021-33044 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2024-09-11. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2021-33044

2 tracked threats in the Threadlinqs corpus reference CVE-2021-33044, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CERT-UA warns of active exploitation of Dahua cameras and recorders via Easy4IP and CVE-2021-33044/CVE-2021-33045 (Operation CameraSwarm)](https://intel.threadlinqs.com/threat/TL-2026-4457) — CRITICAL · 2026-10-26
- [CameraSwarm Campaign Compromises 14,500 Dahua IP Cameras Across Ukraine and Russia](https://intel.threadlinqs.com/threat/TL-2026-2075) — HIGH · 2026-08-19

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Mailing list and disclosure**

- [seclists.org — mailing list](http://seclists.org/fulldisclosure/2021/Oct/13)

**Other references**

- [dahuasecurity.com](https://www.dahuasecurity.com/support/cybersecurity/details/957)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html)

Canonical: https://intel.threadlinqs.com/cve/CVE-2021-33044
Full detection coverage and IOCs for threats exploiting CVE-2021-33044 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp