CVE-2021-33045 — Ipc-Hum7xxx Firmware
CRITICALCVE-2021-33045 is a critical-severity (CVSS 9.8) Improper Authentication vulnerability in dahuasecurity ipc-hum7xxx firmware. It is in CISA's Known Exploited Vulnerabilities catalog (added 2024-08-21) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.
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.
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2024-08-21. Federal agencies were required to remediate by 2024-09-11.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2021-33045.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-33045 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 395,308 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
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.
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
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
How to detect CVE-2021-33045
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2021-33045 -u https://target- Template
- Dahua IPC/VTH/VTO - Authentication Bypass
- Severity
- critical
- Impact
- Unauthenticated attackers can bypass device authentication by constructing malicious login packets, gaining full administrative access to Dahua IPC/VTH/VTO devices.
- Remediation
- Apply firmware updates provided by Dahua to address the authentication bypass vulnerability.
Template by ProjectDiscovery nuclei-templates (phantomowl), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2021-33045 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.