CVE-2021-40407

CRITICALNVD 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
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 48%CVSS: 7.2Exploit: cisa kev · ssvc active · epss top5pctExposed: 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 PROB
48%
EPSS %ILE
99%
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 37× in last 7d / 209× 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 449 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-40407?
CVE-2021-40407 is a critical 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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