Dahua IPC/VTH/VTO - Authentication Bypass (CVE-2021-33044)
416Exploiting IPs reported
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.
CrowdSec analysis
CVE-2021-33044 is an authentication bypass vulnerability present in certain Dahua products, which allows attackers to circumvent device login protections by sending crafted requests.
CrowdSec has been tracking this vulnerability and its exploits since 10th of March 2025.
According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2021-33044 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2021-33044 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2021-33044 is currently experiencing high visibility and active exploitation across the internet.
Attack attempts generally involve requests to URLs containing /rpc2_login.
Exploitation
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Protection
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Blocklist
With our advanced worldwide network detection, CrowdSec can provide a list of IPs known for exploiting the vulnerability.
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