CVE-2021-33045
Published: 15 September 2021
Summary
CVE-2021-33045 is a critical-severity Improper Authentication (CWE-287) vulnerability in Dahuasecurity Xvr-4X04 Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 0.1% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and IA-2 (Identification and Authentication (Organizational Users)).
Deeper analysis
The vulnerability CVE-2021-33045 is an identity authentication bypass present in some Dahua products during the login process and is tracked under CWE-287. It carries a CVSS 3.1 score of 9.8 reflecting network-exploitable conditions with no required privileges or user interaction and full impact on confidentiality, integrity, and availability.
An attacker can exploit the flaw by constructing malicious data packets to bypass device identity authentication, thereby gaining unauthorized access to the affected products.
Public references including Dahua's security advisory at dahuasecurity.com/support/cybersecurity/details/957 along with PacketStorm and Full Disclosure postings document the authentication bypass and related technical details.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-19760
Vulnerability details
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.
- CWE(s)
- KEV Date Added
- 21 August 2024
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires the system to enforce authentication outcomes before granting access, blocking the malicious-packet bypass of the login process.
Mandates unique identification and authentication of users prior to any system access, directly addressing the identity-authentication flaw.
Requires cryptographic or strong device-to-device identification and authentication, mitigating the device-identity bypass vector.