Quantum Secular Labs / Blog / Advisories

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

CVE-2021-33044 is rated critical with a CVSS v3.1 base score of 9.8 and affects Dahua IP Camera Firmware, along with 19 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available. CISA added it to its Known Exploited Vulnerabilities catalog on 2024-08-21, which means exploitation in the wild has been observed.

Vulnerability 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.

Severity breakdown

CVSS v3.1 9.8: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-287: Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Affected products

  • Dahuasecurity Ipc Hum7xxx Firmware: before 2.820.0000000.5.r.210705
  • Dahuasecurity Ipc Hx3xxx Firmware: before 2.800.0000000.29.r.210630
  • Dahuasecurity Ipc Hx5xxx Firmware: before 2.820.0000000.18.r.210705
  • Dahuasecurity Sd1a1 Firmware: before 2.812.0000007.0.r.210706
  • Dahuasecurity Sd22 Firmware: before 2.812.0000007.0.r.210706
  • Dahuasecurity Sd49 Firmware: before 2.812.0000007.0.r.210706
  • Dahuasecurity Sd50 Firmware: before 2.812.0000007.0.r.210706
  • Dahuasecurity Sd52c Firmware: before 2.812.0000007.0.r.210706
  • Dahuasecurity Sd6al Firmware: before 2.812.0000007.0.r.210706
  • Dahuasecurity Tpc Bf1241 Firmware: before 2.630.0000000.6.r.210707
  • Dahuasecurity Tpc Bf2221 Firmware: before 2.630.0000000.10.r.210707
  • Dahuasecurity Tpc Bf5x01 Firmware: before 2.630.0000000.12.r.210707
  • Dahuasecurity Tpc Pt8x21b Firmware: before 2.630.0000000.10.r.210701
  • Dahuasecurity Tpc Sd2221 Firmware: up to and including 2.630.0000000.7.r.210707
  • Dahuasecurity Tpc Sd8x21 Firmware: before 2.630.0000000.9.r.210706

References