CVEs / CVE-2021-33045
CVE-2021-33045: Dahua IP Camera Authentication Bypass Vulnerability
- Known exploited in the CISA KEV catalog since 21 Aug 2024
- critical 9.8 CVSS 3.1 (NVD)
- EPSS 99.5% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Dahua IP cameras and related products contain an authentication bypass vulnerability when the loopback device is specified by the client during authentication.
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| n/a Some Dahua IP Camera, Video Intercom, NVR, XVR devices | Dahua IP Camera devices IPC-HX3XXX, IPC-HX5XXX, and IPC-HUM7XXX Buildtime before May, 2020, Video Intercom devices VTO75X95X, VTO65XXX, and VTH542XH, NVR devices NVR1XXX, NVR2XXX, NVR5XXX, and NVR6XX, XVR devices XVR4xxx, XVR5xxx, and XVR7xxx Buildtime before December, 2019. | — |
Exploitation
| In CISA KEV since | 21 Aug 2024 |
|---|---|
| Due date for US federal agencies | 11 Sep 2024 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-287 |
References
- CVE-2021-33045 on NVD
- CVE-2021-33045 in the CISA KEV catalog
- https://www.dahuasecurity.com/aboutUs/trustedCenter/details/582 (cited by CISA)
- http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html Exploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2021/Oct/13 Exploit, Mailing List, Third Party Advisory
- https://www.dahuasecurity.com/support/cybersecurity/details/957 Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33045 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.