CVE-2021-33045
CRITICALThe identity authentication bypass vulnerability found in some Dahua products during the login process. Attackers can bypass device identity authentication by constructing malicious data packets.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
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 Products
ipc-hum7xxx firmwaredahuasecurityipc-hx3xxx firmwaredahuasecurityipc-hx5xxx firmwaredahuasecuritynvr-1xxx firmwaredahuasecuritynvr-2xxx firmwaredahuasecuritynvr-4xxx firmwaredahuasecurityResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
The identity authentication bypass vulnerability found in some Dahua pro…
The identity authentication bypass vulnerability found in some Dahua pro…
The identity authentication bypass vulnerability found in some Dahua pro…
The identity authentication bypass vulnerability found in some Dahua pro…
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every dahuasecurity ipc-hum7xxx firmware deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.
Fix
Apply the dahuasecurity ipc-hum7xxx firmware security patch or hotfix for CVE-2021-33045 on the affected version, following the vendor advisory for your exact build.
Workarounds
Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.
How O3 protects you
O3 detects and blocks CVE-2021-33045 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.
Tailored to CVE-2021-33045. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2021-33045 being exploited in your environment?
O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2021-33045 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.