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Weekly Signal
Live intelligence Updated 19 Aug 2026 · 12:58 UTC

Dahua, Dahuasecurity · IP Camera Firmware, Ipc-hum7xxx Firmware, Ipc-hx3xxx Firmware +16 more

CVE-2021-33045

Dahua IP Camera Authentication Bypass Vulnerability

Recommended action

Treat this as an immediate remediation priority. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

View response plan
CVSS9.8
EPSS99.6%
KEVYes
ExploitationConfirmed exploitation
PatchPatch or guidance available ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 99.6%; technical severity is CVSS 9.8.

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.

Who should care

  • Teams operating IP Camera Firmware, Ipc-hum7xxx Firmware, Ipc-hx3xxx Firmware +16 more
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether IP Camera Firmware, Ipc-hum7xxx Firmware, Ipc-hx3xxx Firmware +16 more is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Vendor remediation

Patch and remediation links

Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-287
Affected versions
Dahua IP Camera Firmware; Dahuasecurity Ipc-hum7xxx Firmware (End Excluding: 2.820.0000000.5.r.210705); Dahuasecurity Ipc-hx3xxx Firmware (End Excluding: 2.800.0000000.29.r.210630); Dahuasecurity Ipc-hx5xxx Firmware (End Excluding: 2.820.0000000.5.r.210705); Dahuasecurity Nvr-1xxx Firmware (End Excluding: 4.001.0000005.1.r.210709); Dahuasecurity Nvr-2xxx Firmware (End Excluding: 4.001.0000000.1.r.210710); Dahuasecurity Nvr-4xxx Firmware (End Excluding: 4.001.0000005.1.r.210713); Dahuasecurity Nvr-5xxx Firmware (End Excluding: 4.001.0000000.0.r.210710)
Published
15 September 2021
Attack vector
Network
Privileges required
None
User interaction
None

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 99.6%
  4. Signal calculated at 85

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.