IRONSMITHINTEL
CRITICALCVSS9.8
|
Actively Exploited
|CISA KEV|CVE-2021-33044|Auth: none — unauthenticated|Reboot: required|Manual only

Dahua IP Camera Authentication Bypass Vulnerability

Dahua IP cameras and related products contain an authentication bypass vulnerability when the NetKeyboard type argument is specified by the client during authentication.

Published Sep 15, 2021 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2024-09-11 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Improper Authentication (CWE-287) vulnerability in Dahua IP Camera Firmware. 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. Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

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Phishing link

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Malicious file

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Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

IT Security
Running ipc-hum7xxx firmware: v < 2.820.0000000.5.r.210705; ipc-hx3xxx firmware: v < 2.800.0000000.29.r.210630; ipc-hx5xxx firmware: v < 2.820.0000000.18.r.210705; sd1a1 firmware: v < 2.812.0000007.0.r.210706; sd22 firmware: v < 2.812.0000007.0.r.210706; sd49 firmware: v < 2.812.0000007.0.r.210706; sd50 firmware: v < 2.812.0000007.0.r.210706; sd52c firmware: v < 2.812.0000007.0.r.210706; sd6al firmware: v < 2.812.0000007.0.r.210706; tpc-bf1241 firmware: v < 2.630.0000000.6.r.210707; tpc-bf2221 firmware: v < 2.630.0000000.10.r.210707; tpc-bf5x01 firmware: v < 2.630.0000000.12.r.210707; tpc-pt8x21b firmware: v < 2.630.0000000.10.r.210701; tpc-sd2221 firmware: v ≤ 2.630.0000000.7.r.210707; tpc-sd8x21 firmware: v < 2.630.0000000.9.r.210706; vto-65xxx firmware: v < 4.300.0000004.0.r.210715; vto-75x95x firmware: v < 4.300.0000003.0.r.210714; vth-542xh firmware: v < 4.500.0000002.0.r.210715; tpc-bf5x21 firmware: v < 2.630.0000000.8.r.210630
Real-world incidentsWhat we've seen

Active exploitation documented in the wild. Threat-research write-up: http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html

How to patch

Manual remediation steps

Apply the Vendor Patch

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog — apply the vendor's security update as soon as possible.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

References

    1
    Vendor advisory: https://www.dahuasecurity.com/aboutUs/trustedCenter/details/582
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2021-33044
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33044
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