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
Trending — 4 sources updated this weekExploited 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: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
100%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

September 15, 2021

Last Modified

January 13, 2026

Advisory Details (3)

Auto-updated Jul 27, 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 Security

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 31× in last 7d / 181× 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 380 total refreshes for this CVE.

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

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 in the National Vulnerability Database 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 patching attention.
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. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-33044?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33044, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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

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