What’s Vulnerable › Vulnerabilities

CVE-2021-33045: Dahua IP Camera Authentication Bypass Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2024-08-21
• EPSS: 99.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-15 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• Dahuasecurity Ipc-Hum7Xxx Firmware: before 2.820.0000000.5.r.210705 — fixed in 2.820.0000000.5.r.210705
• Dahuasecurity Ipc-Hx3Xxx Firmware: before 2.800.0000000.29.r.210630 — fixed in 2.800.0000000.29.r.210630
• Dahuasecurity Ipc-Hx5Xxx Firmware: before 2.820.0000000.5.r.210705 — fixed in 2.820.0000000.5.r.210705
• Dahuasecurity Nvr-1Xxx Firmware: before 4.001.0000005.1.r.210709 — fixed in 4.001.0000005.1.r.210709
• Dahuasecurity Nvr-2Xxx Firmware: before 4.001.0000000.1.r.210710 — fixed in 4.001.0000000.1.r.210710
• Dahuasecurity Nvr-4Xxx Firmware: before 4.001.0000005.1.r.210713 — fixed in 4.001.0000005.1.r.210713
• Dahuasecurity Nvr-5Xxx Firmware: before 4.001.0000000.0.r.210710 — fixed in 4.001.0000000.0.r.210710
• Dahuasecurity Nvr-6Xx Firmware: before 4.001.0000001.1.r.210716 — fixed in 4.001.0000001.1.r.210716
• Dahuasecurity Vth-542Xh Firmware: before 4.500.0000002.0.r.210715 — fixed in 4.500.0000002.0.r.210715
• Dahuasecurity Vto-65Xxx Firmware: before 4.300.0000004.0.r.210715 — fixed in 4.300.0000004.0.r.210715
• Dahuasecurity Vto-75X95X Firmware: before 4.300.0000003.0.r.210714 — fixed in 4.300.0000003.0.r.210714
• Dahuasecurity Xvr-4X04 Firmware: before 4.001.0000001.1.r.210709 — fixed in 4.001.0000001.1.r.210709
• Dahuasecurity Xvr-4X08 Firmware: before 4.001.0000001.1.r.210709 — fixed in 4.001.0000001.1.r.210709
• Dahuasecurity Xvr-5X04 Firmware: before 4.001.0000003.1.r.210710 — fixed in 4.001.0000003.1.r.210710
• Dahuasecurity Xvr-5X08 Firmware: before 4.001.0000003.1.r.210710 — fixed in 4.001.0000003.1.r.210710
• Dahuasecurity Xvr-5X16 Firmware: before 4.001.0000003.1.r.210710 — fixed in 4.001.0000003.1.r.210710
• Dahuasecurity Xvr-7X16 Firmware: before 4.001.0000003.1.r.210710 — fixed in 4.001.0000003.1.r.210710
• Dahuasecurity Xvr-7X32 Firmware: before 4.001.0000003.1.r.210710 — fixed in 4.001.0000003.1.r.210710

How to fix

Upgrade to a fixed version: Dahuasecurity Ipc-Hum7Xxx Firmware 2.820.0000000.5.r.210705; Dahuasecurity Ipc-Hx3Xxx Firmware 2.800.0000000.29.r.210630; Dahuasecurity Ipc-Hx5Xxx Firmware 2.820.0000000.5.r.210705; Dahuasecurity Nvr-1Xxx Firmware 4.001.0000005.1.r.210709; Dahuasecurity Nvr-2Xxx Firmware 4.001.0000000.1.r.210710; Dahuasecurity Nvr-4Xxx Firmware 4.001.0000005.1.r.210713; Dahuasecurity Nvr-5Xxx Firmware 4.001.0000000.0.r.210710; Dahuasecurity Nvr-6Xx Firmware 4.001.0000001.1.r.210716; Dahuasecurity Vth-542Xh Firmware 4.500.0000002.0.r.210715; Dahuasecurity Vto-65Xxx Firmware 4.300.0000004.0.r.210715; Dahuasecurity Vto-75X95X Firmware 4.300.0000003.0.r.210714; Dahuasecurity Xvr-4X04 Firmware 4.001.0000001.1.r.210709. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html
• http://seclists.org/fulldisclosure/2021/Oct/13
• https://www.dahuasecurity.com/support/cybersecurity/details/957
• http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html
• http://seclists.org/fulldisclosure/2021/Oct/13
• https://www.dahuasecurity.com/support/cybersecurity/details/957
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33045

Get alerted when CVE-2021-33045 or the next vulnerability affects your stack