CVE-2021-33044 (GCVE-0-2021-33044)

Vulnerability from cvelistv5 – Published: 2021-09-15 21:36 – Updated: 2026-01-12 19:53
VLAI CISA Previdian
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-05 14:59 UTC
CWE
  • Improper Authentication
  • CWE-287 - Improper Authentication
Assigner
References
Impacted products
Vendor Product Version
n/a Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal Camera devices Affected: 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.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 32d86d14-1997-4820-93b6-cf52ee26f681

Vulnerability ID: CVE-2021-33044

Status: Confirmed

Status Updated: 2024-08-21 02:00 CEST

Exploited: Yes

Timestamps
First Seen: 2024-08-21
Asserted: 2024-08-21
Scope
Notes: Dahua IP Camera Authentication Bypass Vulnerability | Affected: Dahua / IP Camera Firmware | Description: Dahua IP cameras and related products contain an authentication bypass vulnerability when the NetKeyboard type argument is specified by the client during authentication. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2024-09-11 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.dahuasecurity.com/aboutUs/trustedCenter/details/582; https://nvd.nist.gov/vuln/detail/CVE-2021-33044
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-287
Feed CISA Known Exploited Vulnerabilities Catalog
Product IP Camera Firmware
Due Date 2024-09-11
Date Added 2024-08-21
Vendorproject Dahua
Vulnerabilityname Dahua IP Camera Authentication Bypass Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-10-02 08:09 CEST | Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 37df7b0b-0e22-4ad3-8faf-426e4c8c3b45

Vulnerability ID: CVE-2021-33044

Status: Confirmed

Status Updated: 2024-08-21 02:00 CEST

Exploited: Yes

Timestamps
First Seen: 2024-08-21
Asserted: 2024-08-21
Scope
Notes: The identity authentication bypass vulnerability found in some Dahua products during the login process. Attackers can bypass device identity... | Affected: Dahua / Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal Camera devices | CVSS: 9.8 (CRITICAL) | EPSS: 0.99987 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title The identity authentication bypass vulnerability found in some Dahua products during the login process. Attackers can bypass device identity...
Cve Id CVE-2021-33044
Vendor Dahua
Ghsa Id None
Product Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal Camera devices
Added Date 2024-08-21T00:00:00.000Z
Cvss Score 9.8
Epss Score 0.99987
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.99984
Used In Malware unknown
Vulnerability Id CVE-2021-33044
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-10-02 09:11 CEST | Updated: 2026-10-02 09:11 CEST
Show details on NVD website
To clipboard 

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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.