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CVE-2021-33045

Dahua IP Camera Authentication Bypass

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 99.6%
  1. Published15 Sept 2021
  2. Added to CISA KEV21 Aug 2024
  3. Remediation due11 Sept 2024
Actively exploited (CISA KEV)

Dahua IP cameras and related products contain an authentication bypass vulnerability when the loopback device is specified by the client during authentication.

Added to KEV: 21 Aug 2024Federal remediation due: 11 Sept 2024

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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
Dahuasecurity Xvr-4x08 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

Remediation

Fixed in
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

References

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Frequently asked

Is CVE-2021-33045 being actively exploited?

Yes. CVE-2021-33045 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 21 Aug 2024.

How severe is CVE-2021-33045?

CVE-2021-33045 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 99.6% probability of exploitation.

Which products are affected by CVE-2021-33045?

Affected products include Dahuasecurity Ipc-hum7xxx Firmware, Dahuasecurity Ipc-hx3xxx Firmware, Dahuasecurity Ipc-hx5xxx Firmware, Dahuasecurity Nvr-1xxx Firmware, Dahuasecurity Nvr-2xxx Firmware, and 13 more.

How do I fix CVE-2021-33045?

Upgrade affected software to a fixed version, for example 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 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-33045 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.