CVE-2021-40407

HIGHNVD 7.29.8▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2024-12-18), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.2 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
7.2
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 48%CVSS: 7.2Exploit: NoneExposed: 0

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

An OS command injection vulnerability exists in the device network settings functionality of reolink RLC-410W v3.0.0.136_20121102. At [1] or [2], based on DDNS type, the ddns->domain variable, that has the value of the domain parameter provided through the SetDdns API, is not validated properly. This would lead to an OS command injection. An attacker can send an HTTP request to trigger this vulnerability.

CVSS v3
7.2
EG Score
9.8(high)
EG Risk
84(Attend)
EG Risk 84/100SSVC: Attend

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%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
98.7%
KEV
⚠ Exploited

Published

January 28, 2022

Last Modified

November 3, 2025

Advisory Details (2)

Auto-updated Jun 11, 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-2021-40407
generic

TALOS-2021-1424 || Cisco Talos Intelligence Group - Comprehensive Threat Intelligence

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1424

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 43× in last 7d / 214× 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 416 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2021-40407?
CVE-2021-40407 is a high vulnerability published on January 28, 2022. An OS command injection vulnerability exists in the device network settings functionality of reolink RLC-410W v3.0.0.136_20121102. At [1] or [2], based on DDNS type, the ddns->domain variable, that has the value of the domain parameter provided through the SetDdns API, is not validated properly.…
When was CVE-2021-40407 disclosed?
CVE-2021-40407 was first published in the National Vulnerability Database on January 28, 2022, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-40407 actively exploited?
Yes. CISA added CVE-2021-40407 to the Known Exploited Vulnerabilities catalog on December 18, 2024, affecting Reolink RLC-410W IP Camera. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-40407?
CVE-2021-40407 has a CVSS v3 base score of 7.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
Which products are affected by CVE-2021-40407?
CVE-2021-40407 affects Reolink RLC-410W IP Camera. 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-2021-40407?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-40407, 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.

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