CVE-2021-33044
Confirmed PUBLISHEDThe identity authentication bypass vulnerability found in some Dahua products during the login process. Attackers can bypass device identity...
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Sep 15, 2021
- Exploitation Reported
- Aug 21, 2024
- CVSS
- 9.8 Critical
- EPSS
- 99.9%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| 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, 2021. |
Affected |
CVE References
- 20211005 [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045) seclists.org · Mailing List http://seclists.org/fulldisclosure/2021/Oct/13
- dahuasecurity.com/support/cybersecurity/details/957 dahuasecurity.com · CVE Record https://www.dahuasecurity.com/support/cybersecurity/details/957
- packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypa...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2024-08-21 00:00 UTC |
| The Shadowserver | 2026-07-08 00:00 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-33044.yaml | Apr 25, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:C/I:C/A:C
Exploitation Status
Exploited in the wild
Recorded 2024-08-21 00:00:00 UTC · CISA
Proof of concept available
Recorded 2021-10-18 16:17:05 UTC · GitHub
Weaknesses (CWE)
-
Improper Authentication
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-33044.yaml | Apr 25, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2021-10-18 16:17:05 UTC · 0 stars
Dahua IPC/VTH/VTO devices auth bypass exploit
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC 14 days ago00:00 UTC · 14 days ago
KEV confirmed by The Shadowserver
Exploitation attested by an external source
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Nuclei template available
Scanner coverage available
-
00:00 UTC almost 2 years ago00:00 UTC · almost 2 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
16:17 UTC almost 5 years ago16:17 UTC · almost 5 years ago
Public PoC available
Public proof-of-concept code published
-
21:36 UTC almost 5 years ago21:36 UTC · almost 5 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC about 5 years ago00:00 UTC · about 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-33044
{
"cve_id": "CVE-2021-33044",
"title": "The identity authentication bypass vulnerability found in some Dahua products...",
"affected_vendor": "Dahua",
"affected_product": "Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal Camera devices",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.8,
"epss_score": 0.99871,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}