CVE-2021-33045
CriticalExploitedPublic exploitThe identity authentication bypass vulnerability found in some Dahua products during the login process.
Published Sep 15, 2021 · Updated Jan 13, 2026
Key Facts
Patch immediately- CVE-2021-33045 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Ipc-Hum7xxx Firmware (Dahuasecurity), Ipc-Hx3xxx Firmware (Dahuasecurity), Ipc-Hx5xxx Firmware (Dahuasecurity) and 16 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 21, 2024. Public exploit code is available.
- EPSS estimates a 100% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipc-Hum7xxx Firmware 2.820.0000000.5.r.210705, Ipc-Hx3xxx Firmware 2.800.0000000.29.r.210630, Ipc-Hx5xxx Firmware 2.820.0000000.5.r.210705.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
100%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-33045 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Aug 21, 2024 | Sep 11, 2024 | Not reported |
| Industry KEV feed | Aug 21, 2024 | Sep 11, 2024 | Not reported |
| CIRCL KEV | Aug 21, 2024 | Sep 11, 2024 | Not reported |
| ENISA EUVD | Aug 21, 2024 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
20 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Ipc-Hum7xxx FirmwareDahuasecurity | See advisory | 2.820.0000000.5.r.210705 |
| Ipc-Hx3xxx FirmwareDahuasecurity | See advisory | 2.800.0000000.29.r.210630 |
| Ipc-Hx5xxx FirmwareDahuasecurity | See advisory | 2.820.0000000.5.r.210705 |
| Nvr-1xxx FirmwareDahuasecurity | See advisory | 4.001.0000005.1.r.210709 |
| Nvr-2xxx FirmwareDahuasecurity | See advisory | 4.001.0000000.1.r.210710 |
Patched Releases
Ipc-Hum7xxx Firmware
2.820.0000000.5.r.210705
Ipc-Hx3xxx Firmware
2.800.0000000.29.r.210630
Ipc-Hx5xxx Firmware
2.820.0000000.5.r.210705
Nvr-1xxx Firmware
4.001.0000005.1.r.210709
Nvr-2xxx Firmware
4.001.0000000.1.r.210710
Nvr-4xxx Firmware
4.001.0000005.1.r.210713
Nvr-5xxx Firmware
4.001.0000000.0.r.210710
Nvr-6xx Firmware
4.001.0000001.1.r.210716
Vth-542xh Firmware
4.500.0000002.0.r.210715
Vto-65xxx Firmware
4.300.0000004.0.r.210715
Vto-75x95x Firmware
4.300.0000003.0.r.210714
Xvr-4x04 Firmware
4.001.0000001.1.r.210709
Xvr-4x08 Firmware
4.001.0000001.1.r.210709
Xvr-5x04 Firmware
4.001.0000003.1.r.210710
Xvr-5x08 Firmware
4.001.0000003.1.r.210710
Xvr-5x16 Firmware
4.001.0000003.1.r.210710
Xvr-7x16 Firmware
4.001.0000003.1.r.210710
Xvr-7x32 Firmware
4.001.0000003.1.r.210710
Timeline
Publicly disclosed
Sep 15, 2021
Added to CISA KEV
Aug 21, 2024
Added to Industry KEV feed
Aug 21, 2024
Added to CIRCL KEV
Aug 21, 2024
Added to ENISA EUVD
Aug 21, 2024
Last updated
Jan 13, 2026
Weakness Type
- CWE-287 Improper Authentication
References
- advisoryhttps://www.dahuasecurity.com/support/cybersecurity/details/957
- exploithttp://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html
- exploit20211005 [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045)
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
The identity authentication bypass vulnerability found in some Dahua products during the login process.
Affected: Ipc-Hum7xxx Firmware (Dahuasecurity); Ipc-Hx3xxx Firmware (Dahuasecurity); Ipc-Hx5xxx Firmware (Dahuasecurity), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 21, 2024.
Yes. It was added on Aug 21, 2024 with a federal remediation due date of Sep 11, 2024.
Public exploit code is available.
Fixed versions are available, including Ipc-Hum7xxx Firmware 2.820.0000000.5.r.210705, Ipc-Hx3xxx Firmware 2.800.0000000.29.r.210630, Ipc-Hx5xxx Firmware 2.820.0000000.5.r.210705.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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