CVE-2021-33044

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2024-08-21), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Exploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 100%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
99
EG Risk 99/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low mission impact; Act at medium or high.
Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
EPSS PROB
100%
EPSS %ILE
99th
KEV
⚠ Exploited

CISA SSVCAttend at low mission impact; Act at medium or high.

A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 15, 2021

Last Modified

January 13, 2026

Advisory Details (3)

Auto-updated Oct 1, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33044
generic

Full Disclosure: [Update]: Dahua Authentication bypass (CVE-2021-33044, CVE-2021-33045)

http://seclists.org/fulldisclosure/2021/Oct/13
generic

Packet Storm - Human Validation

http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 41× in last 7d / 190× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 809 total refreshes for this CVE.

  1. 2026-10-05 18:00 UTCGHSA enrichment
  2. 2026-10-05 13:49 UTCGHSA enrichment
  3. 2026-10-05 09:37 UTCGHSA enrichment
  4. 2026-10-05 05:26 UTCGHSA enrichment
  5. 2026-10-05 01:14 UTCGHSA enrichment
  6. 2026-10-04 21:02 UTCGHSA enrichment
  7. 2026-10-04 16:48 UTCGHSA enrichment
  8. 2026-10-04 12:36 UTCGHSA enrichment
  9. 2026-10-04 08:24 UTCGHSA enrichment
  10. 2026-10-04 04:12 UTCGHSA enrichment
  11. 2026-10-04 00:00 UTCGHSA enrichment
  12. 2026-10-03 19:49 UTCGHSA enrichment
  13. 2026-10-03 15:37 UTCGHSA enrichment
  14. 2026-10-03 11:25 UTCGHSA enrichment
  15. 2026-10-03 07:10 UTCGHSA enrichment
  16. 2026-10-03 02:58 UTCGHSA enrichment
  17. 2026-10-02 22:45 UTCGHSA enrichment
  18. 2026-10-02 18:32 UTCGHSA enrichment
  19. 2026-10-02 14:21 UTCGHSA enrichment
  20. 2026-10-02 10:09 UTCGHSA enrichment
  21. 2026-10-02 05:57 UTCGHSA enrichment
  22. 2026-10-02 01:44 UTCGHSA enrichment
  23. 2026-10-01 21:32 UTCGHSA enrichment
  24. 2026-10-01 17:21 UTCGHSA enrichment
  25. 2026-10-01 13:07 UTCGHSA enrichment
Show 75 more
  1. 2026-10-01 08:56 UTCGHSA enrichment
  2. 2026-10-01 04:43 UTCGHSA enrichment
  3. 2026-10-01 00:30 UTCGHSA enrichment
  4. 2026-09-30 20:17 UTCGHSA enrichment
  5. 2026-09-30 16:06 UTCGHSA enrichment
  6. 2026-09-30 11:54 UTCGHSA enrichment
  7. 2026-09-30 07:42 UTCGHSA enrichment
  8. 2026-09-30 03:29 UTCGHSA enrichment
  9. 2026-09-29 23:16 UTCGHSA enrichment
  10. 2026-09-29 19:05 UTCGHSA enrichment
  11. 2026-09-29 14:53 UTCGHSA enrichment
  12. 2026-09-29 10:41 UTCGHSA enrichment
  13. 2026-09-29 06:26 UTCGHSA enrichment
  14. 2026-09-29 02:15 UTCGHSA enrichment
  15. 2026-09-28 22:02 UTCEG score recompute
  16. 2026-09-28 22:02 UTCGHSA enrichment
  17. 2026-09-28 17:50 UTCGHSA enrichment
  18. 2026-09-28 13:38 UTCGHSA enrichment
  19. 2026-09-28 09:27 UTCGHSA enrichment
  20. 2026-09-28 05:15 UTCGHSA enrichment
  21. 2026-09-28 01:04 UTCGHSA enrichment
  22. 2026-09-27 21:51 UTCCISA KEV update
  23. 2026-09-27 20:52 UTCGHSA enrichment
  24. 2026-09-27 16:40 UTCGHSA enrichment
  25. 2026-09-27 12:29 UTCGHSA enrichment
  26. 2026-09-27 08:17 UTCGHSA enrichment
  27. 2026-09-27 04:05 UTCGHSA enrichment
  28. 2026-09-26 23:53 UTCGHSA enrichment
  29. 2026-09-26 19:41 UTCGHSA enrichment
  30. 2026-09-26 15:27 UTCGHSA enrichment
  31. 2026-09-26 11:15 UTCGHSA enrichment
  32. 2026-09-26 07:02 UTCGHSA enrichment
  33. 2026-09-26 02:50 UTCGHSA enrichment
  34. 2026-09-25 22:38 UTCGHSA enrichment
  35. 2026-09-25 19:35 UTCCISA KEV update
  36. 2026-09-25 18:26 UTCGHSA enrichment
  37. 2026-09-25 14:55 UTCCISA KEV update
  38. 2026-09-25 14:14 UTCGHSA enrichment
  39. 2026-09-25 10:01 UTCGHSA enrichment
  40. 2026-09-25 05:49 UTCGHSA enrichment
  41. 2026-09-25 01:38 UTCGHSA enrichment
  42. 2026-09-24 21:26 UTCGHSA enrichment
  43. 2026-09-24 19:31 UTCCISA KEV update
  44. 2026-09-24 17:14 UTCEG score recompute
  45. 2026-09-24 17:14 UTCGHSA enrichment
  46. 2026-09-24 14:00 UTCEPSS rescore
  47. 2026-09-24 13:02 UTCGHSA enrichment
  48. 2026-09-24 08:50 UTCGHSA enrichment
  49. 2026-09-24 04:39 UTCGHSA enrichment
  50. 2026-09-24 00:26 UTCGHSA enrichment
  51. 2026-09-23 20:14 UTCGHSA enrichment
  52. 2026-09-23 16:02 UTCGHSA enrichment
  53. 2026-09-23 11:51 UTCGHSA enrichment
  54. 2026-09-23 07:38 UTCGHSA enrichment
  55. 2026-09-23 03:26 UTCGHSA enrichment
  56. 2026-09-22 23:14 UTCGHSA enrichment
  57. 2026-09-22 19:36 UTCCISA KEV update
  58. 2026-09-22 19:01 UTCGHSA enrichment
  59. 2026-09-22 14:50 UTCGHSA enrichment
  60. 2026-09-22 10:37 UTCGHSA enrichment
  61. 2026-09-22 06:25 UTCGHSA enrichment
  62. 2026-09-22 02:13 UTCGHSA enrichment
  63. 2026-09-21 22:01 UTCGHSA enrichment
  64. 2026-09-21 19:09 UTCCISA KEV update
  65. 2026-09-21 17:49 UTCGHSA enrichment
  66. 2026-09-21 13:37 UTCGHSA enrichment
  67. 2026-09-21 09:25 UTCGHSA enrichment
  68. 2026-09-21 05:13 UTCGHSA enrichment
  69. 2026-09-21 01:01 UTCGHSA enrichment
  70. 2026-09-20 20:48 UTCGHSA enrichment
  71. 2026-09-20 16:36 UTCGHSA enrichment
  72. 2026-09-20 12:24 UTCGHSA enrichment
  73. 2026-09-20 08:10 UTCGHSA enrichment
  74. 2026-09-20 03:59 UTCGHSA enrichment
  75. 2026-09-19 23:47 UTCGHSA enrichment

Publicly available exploits

(6 references)

Working exploit code is in the public domain (5 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCBd-Mutant7/DahuaLoginBypass
    First seen Mar 28, 2026

    Chrome extension that uses vulnerabilities CVE-2021-33044 and CVE-2021-33045 to log in to Dahua cameras without authentication.

    Open source ↗
  • GitHub PoCumair-aziz025/dahua-cve-research
    First seen Mar 3, 2026

    Dahua IP camera CVE research toolkit (CVE-2021-33044/33045, CVE-2025-31700/31701)

    Open source ↗
  • GitHub PoChaingn/LoHongCam-CVE-2021-33044
    First seen Oct 22, 2023
    Open source ↗
  • GitHub PoCSpy0x7/CVE-2021-33044
    First seen Oct 18, 2021

    Dahua IPC/VTH/VTO devices auth bypass exploit

    Open source ↗
  • GitHub PoCbp2008/DahuaLoginBypass
    First seen Oct 11, 2021

    Chrome extension that uses vulnerabilities CVE-2021-33044 and CVE-2021-33045 to log in to Dahua cameras without authentication.

    Open source ↗
  • Nucleihttp/cves/2021/CVE-2021-33044.yaml
    First seen Jan 1, 2021

    Dahua IPC/VTH/VTO - Authentication Bypass

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-33044?
CVE-2021-33044 is a critical vulnerability published on September 15, 2021. 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.
When was CVE-2021-33044 disclosed?
CVE-2021-33044 was first published on September 15, 2021, with the most recent update on January 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-33044 actively exploited?
Yes. CISA added CVE-2021-33044 to the Known Exploited Vulnerabilities catalog on August 21, 2024, affecting Dahua IP Camera Firmware. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is available. Apply it.
What is the CVSS score of CVE-2021-33044?
CVE-2021-33044 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2021-33044?
CVE-2021-33044 affects Dahua IP Camera Firmware.
How do I remediate CVE-2021-33044?
A fix for CVE-2021-33044 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2021-33044

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