Secuno
ENNL
Book demo

CVE-2021-33044

Dahua IP Camera Authentication Bypass

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 100.0%
  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 NetKeyboard type argument 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< 2.820.0000000.18.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-bf5x21 Firmware< 2.630.0000000.8.r.210630
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 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

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≥ 2.820.0000000.18.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

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-843138.8
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, POST…
CVE-2026-1093728.7
ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in…
CVE-2026-1093138.1
Grav Login plugin 2.7.0 before 3.9.9 contains an authentication bypass vulnerability…
CVE-2026-1093128.1
Grav Login plugin 2.7.0 before 3.9.9 contains an authentication bypass in…
CVE-2026-10890710.0
A vulnerability was determined in Netcore NR268 1.7.121109. Affected is the function…
CVE-2026-1088658.2
AmoyLab Unla through 0.10.0 contains an authentication bypass vulnerability that allows…

Frequently asked

Is CVE-2021-33044 being actively exploited?

Yes. CVE-2021-33044 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 21 Aug 2024.

How severe is CVE-2021-33044?

CVE-2021-33044 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 100.0% probability of exploitation.

Which products are affected by CVE-2021-33044?

Affected products include Dahuasecurity Ipc-hum7xxx Firmware, Dahuasecurity Ipc-hx3xxx Firmware, Dahuasecurity Ipc-hx5xxx Firmware, Dahuasecurity Sd1a1 Firmware, Dahuasecurity Sd22 Firmware, and 14 more.

How do I fix CVE-2021-33044?

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 2.820.0000000.18.r.210705 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-33044 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.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

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