CVE-2021-33045: Dahua IP Camera Authentication Bypass Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 21 Aug 2024, 1,071 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 99.6%
EPSS score, percentile 99.9 of all scored records
- How severe?
- 9.8 Critical
CVSS v3.1 base score, from CISA's enrichment of the record
- What should I do?
CISA deadline 11 Sep 2024. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- Dahua IP Camera devices IPC-HX3XXX, IPC-HX5XXX, and IPC-HUM7XXX Buildtime befor…
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: 11 September 2024.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- https://www.dahuasecurity.com/aboutUs/trustedCenter/details/582
- https://nvd.nist.gov/vuln/detail/CVE-2021-33045
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | Dahua IP Camera devices IPC-HX3XXX, IPC-HX5XXX, and IPC-HUM7XXX Buildtime befor… |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Dahua IP cameras and related products contain an authentication bypass vulnerability when the loopback device is specified by the client during authentication.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2021-33045 to its Known Exploited Vulnerabilities (KEV) catalog on 21 Aug 2024.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 11 Sep 2024.
- The CVE record was published on 15 Sep 2021, 1,071 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), taken from CISA's enrichment of the record.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 99.6% (percentile 99.9), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-287: Improper Authentication
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 15 Sep 2021 | CVE record published |
| 21 Aug 2024 | Added to CISA KEV |
| 11 Sep 2024 | CISA due date for the required action |
| 12 Jan 2026 | CVE record last updated |
References
- dahuasecurity.com
- 20211005 [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045)
- packetstormsecurity.com
More exploited Dahua vulnerabilities
- CVE-2021-33044: Dahua IP Camera Authentication Bypass Vulnerability