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ExploitedIn CISA KEVFix available

CVE-2021-33045

Exploitation confirmed. First attested on 2024-08-21 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-09-15
  • Fixed in4.001.0000001.1.r.210709
  • WeaknessCWE-287

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-09-1522:15CVE publishedNVD
  2. 2024-08-21Added to the CISA KEV catalogCISA KEV
  3. 2024-08-21Listed as exploited by GCVEGCVE
  4. 2024-08-21Exploitation first reportedCISA KEV
  5. 2024-09-0515:03SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-33045?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-33045?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Dahuasecurity xvr-4x04 firmwareversion to verify
BranchAffectedFixed in
4.1< 4.001.0000001.1.r.2107094.001.0000001.1.r.210709
—all versionsno fix published
Dahuasecurity ipc-hum7xxx firmwareversion to verify
BranchAffectedFixed in
2.820< 2.820.0000000.5.r.2107052.820.0000000.5.r.210705
Dahuasecurity ipc-hx3xxx firmwareversion to verify
BranchAffectedFixed in
2.800< 2.800.0000000.29.r.2106302.800.0000000.29.r.210630

15 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As dahua, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Some Dahua IP Camera, Video Intercom, NVR, XVR devices
    Affected
    • = Dahua IP Camera devices IPC-HX3XXX, IPC-HX5XXX, and IPC-HUM7XXX Buildtime before May, 2020, Video Intercom devices VTO75X95X, VTO65XXX, and VTH542XH, NVR devices NVR1XXX, NVR2XXX, NVR5XXX, and NVR6XX, XVR devices XVR4xxx, XVR5xxx, and XVR7xxx Buildtime before December, 2019.no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-10-06

Fix

  1. Update Dahuasecurity xvr-4x04 firmware to 4.001.0000001.1.r.210709
  2. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2024-09-11

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifieddongpohezui/cve-2021-33045
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2024-08-21
Patch Due Date
2024-09-11
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-09-15
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-9vwj-hj2h-whjq

Frequently asked questions

What is CVE-2021-33045?

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.

Is CVE-2021-33045 actively exploited?

Yes. CVE-2021-33045 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2024-09-11.

What is the CVSS score for CVE-2021-33045?

CVE-2021-33045 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record