CVE-2021-33045
CRITICALCVSS 9.8/10Actively ExploitedEPSS 99.56%
Last modified
CVE-2021-33045 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 99.56% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Dahuasecurity | Ipc-Hum7xxx Firmware | < 2.820.0000000.5.r.210705 |
| Dahuasecurity | Ipc-Hx3xxx Firmware | < 2.800.0000000.29.r.210630 |
| Dahuasecurity | Ipc-Hx5xxx Firmware | < 2.820.0000000.5.r.210705 |
| Dahuasecurity | Nvr-1xxx Firmware | < 4.001.0000005.1.r.210709 |
| Dahuasecurity | Nvr-2xxx Firmware | < 4.001.0000000.1.r.210710 |
| Dahuasecurity | Nvr-4xxx Firmware | < 4.001.0000005.1.r.210713 |
| Dahuasecurity | Nvr-5xxx Firmware | < 4.001.0000000.0.r.210710 |
| Dahuasecurity | Nvr-6xx Firmware | < 4.001.0000001.1.r.210716 |
| 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 |
| Dahuasecurity | Xvr-4x04 Firmware | All versions |
| Dahuasecurity | Xvr-4x08 Firmware | < 4.001.0000001.1.r.210709 |
| Dahuasecurity | Xvr-4x04 Firmware | < 4.001.0000001.1.r.210709 |
| Dahuasecurity | Xvr-5x04 Firmware | < 4.001.0000003.1.r.210710 |
| Dahuasecurity | Xvr-5x08 Firmware | < 4.001.0000003.1.r.210710 |
| Dahuasecurity | Xvr-5x16 Firmware | < 4.001.0000003.1.r.210710 |
| Dahuasecurity | Xvr-7x16 Firmware | < 4.001.0000003.1.r.210710 |
| Dahuasecurity | Xvr-7x32 Firmware | < 4.001.0000003.1.r.210710 |
References
- http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2021/Oct/13Exploit, Mailing List, Third Party Advisory
- http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2021/Oct/13Exploit, Mailing List, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33045US Government Resource
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2021-33045?
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.
How severe is CVE-2021-33045?
CVE-2021-33045 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 99.56% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2021-33045?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-33045?
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Scan your code nowSource: NVD / NIST