Security Digest · Vulnerability record · Known exploited
CVE-2021-33044: Dahua IP Camera Authentication Bypass Vulnerability
Exploited in the wild (CISA KEV). The identity authentication bypass vulnerability found in some Dahua products during the login process.
CISA KEV · added 2024-08-21 CVSS 9.8 Critical EPSS 100.0% · p100.0
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Dahua IP Camera Firmware. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-08-21, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-09-11; treat that as the outer limit, not the target.
- EPSS 100.0%, percentile 100.0: FIRST’s model estimates a 100.0% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
What it is
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.
CISA’s summary
Dahua IP cameras and related products contain an authentication bypass vulnerability when the NetKeyboard type argument is specified by the client during authentication.
Weakness type: CWE-287.
Product: Dahua IP Camera Firmware · Assigned by: dahua · Published: 2021-09-15
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| n/a | Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal Camera devices | Dahua IP Camera devices IPC-HX3XXX, IPC-HX5XXX, and IPC-HUM7XXX, Video Intercom devices VTO75X95X, VTO65XXX, and VTH542XH, PTZ Dome Camera SD1A1, SD22, SD49, SD50, SD52C, and SD6AL, Thermal TPC-BF1241, TPC-BF2221, TPC-SD2221, TPC-BF5XXX, TPC-SD8X21, and TPC-PT8X21B devices Buildtime before June… |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADP | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2024-08-21; federal due date 2024-09-11. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 99.99% probability of exploitation activity in the next 30 days; percentile 100.0.
Timeline
- — CVE record published by dahua
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (dahuasecurity.com) dahuasecurity.com
Vulnerability records
- CVE.org record CVE-2021-33044 cve.org
- NVD entry CVE-2021-33044 nvd.nist.gov
Government
Other references from the CVE record and advisory
- dahuasecurity.com dahuasecurity.com
- 20211005 [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045) seclists.org
- packetstormsecurity.com packetstormsecurity.com
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