CVE-2021-33045Known exploitationPublic exploitNetwork attack vector

Unauthenticated device access via malicious login packets

Published Sep 15, 2021 · Updated Jan 12, 2026

Authentication bypass in Dahua IP cameras before May 2020 allows remote attackers to access devices via malicious login packets. The login handler accepts specially constructed packets without completing device identity authentication. The attack requires network reachability to the device login service and can expose or alter device functions.

CVSS severity9.8
Critical
EPSS probability99.56%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Dahua IP cameras before May 2020 allows remote attackers to access devices via malicious login packets. The login handler accepts specially constructed packets without completing device identity authentication. The attack requires network reachability to the device login service and can expose or alter device functions.

The record

CVE
CVE-2021-33045
Published
Sep 15, 2021
Updated
Jan 12, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2024Exploitation reportedCISA Known Exploited Vulnerabilities listing
  3. Jan 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.3Dahua PSIRTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
8.1Dahua PSIRTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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