CVE-2021-33045

Name: CVE-2021-33045
Creator: NVD / NIST
Published: 2021-09-15T22:15:10.687+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 99.56%

Last modified Jun 17, 2026

CVE-2021-33045 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 99.56% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

99.56%

99.9th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Sep 11, 2024.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
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	All versions
Dahuasecurity	Xvr-4x08 Firmware	< 4.001.0000001.1.r.210709
Dahuasecurity	Xvr-4x04 Firmware	< 4.001.0000001.1.r.210709
Dahuasecurity	Xvr-5x04 Firmware	< 4.001.0000003.1.r.210710
Dahuasecurity	Xvr-5x08 Firmware	< 4.001.0000003.1.r.210710
Dahuasecurity	Xvr-5x16 Firmware	< 4.001.0000003.1.r.210710
Dahuasecurity	Xvr-7x16 Firmware	< 4.001.0000003.1.r.210710
Dahuasecurity	Xvr-7x32 Firmware	< 4.001.0000003.1.r.210710

References

http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Oct/13Exploit, Mailing List, Third Party Advisory
https://www.dahuasecurity.com/support/cybersecurity/details/957Vendor Advisory
http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Oct/13Exploit, Mailing List, Third Party Advisory
https://www.dahuasecurity.com/support/cybersecurity/details/957Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33045US Government Resource

Timeline

Published: Sep 15, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-33045?

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.

How severe is CVE-2021-33045?

CVE-2021-33045 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 99.56% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-33045?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-33045?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST