CVE-2021-33044

Name: CVE-2021-33044
Creator: NVD / NIST
Published: 2021-09-15T22:15:10.497+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 99.87%

Last modified Jun 17, 2026

CVE-2021-33044 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 99.87% 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

99.87%

100.0th 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	< 2.820.0000000.18.r.210705
Dahuasecurity	Sd1a1 Firmware	< 2.812.0000007.0.r.210706
Dahuasecurity	Sd22 Firmware	< 2.812.0000007.0.r.210706
Dahuasecurity	Sd49 Firmware	< 2.812.0000007.0.r.210706
Dahuasecurity	Sd50 Firmware	< 2.812.0000007.0.r.210706
Dahuasecurity	Sd52c Firmware	< 2.812.0000007.0.r.210706
Dahuasecurity	Sd6al Firmware	< 2.812.0000007.0.r.210706
Dahuasecurity	Tpc-Bf1241 Firmware	< 2.630.0000000.6.r.210707
Dahuasecurity	Tpc-Bf2221 Firmware	< 2.630.0000000.10.r.210707
Dahuasecurity	Tpc-Bf5x01 Firmware	< 2.630.0000000.12.r.210707
Dahuasecurity	Tpc-Pt8x21b Firmware	< 2.630.0000000.10.r.210701
Dahuasecurity	Tpc-Sd2221 Firmware	<= 2.630.0000000.7.r.210707
Dahuasecurity	Tpc-Sd8x21 Firmware	< 2.630.0000000.9.r.210706
Dahuasecurity	Vto-65xxx Firmware	< 4.300.0000004.0.r.210715
Dahuasecurity	Vto-75x95x Firmware	< 4.300.0000003.0.r.210714
Dahuasecurity	Vth-542xh Firmware	< 4.500.0000002.0.r.210715
Dahuasecurity	Tpc-Bf5x21 Firmware	< 2.630.0000000.8.r.210630

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-2021-33044US Government Resource

Timeline

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

Frequently Asked Questions

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.

How severe is CVE-2021-33044?

CVE-2021-33044 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 99.87% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-33044?

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-2021-33044?

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

Scan your code now

Source: NVD / NIST