CVE-2021-36380

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 2024-03-05), 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
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 98%CVSS: 9.8Exploit: NoneExposed: 0

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

Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or dnsAddr /cgi/networkDiag.cgi.

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
99.9%
KEV
⚠ Exploited

Published

August 13, 2021

Last Modified

November 5, 2025

Advisory Details (3)

Auto-updated Jun 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-2021-36380
generic

SureLine® | Sunhillo

https://www.sunhillo.com/product/sureline/
generic

Cyber Security Research | NCC Group

https://research.nccgroup.com/2021/07/26/technical-advisory-sunhillo-sureline-unauthenticated-os-command-injection-cve-2021-36380/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 37× in last 7d / 187× 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 359 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Nucleihttp/cves/2021/CVE-2021-36380.yaml
    First seen Jan 1, 2021

    Sunhillo SureLine <8.7.0.1.1 - Unauthenticated OS Command Injection

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-36380?
CVE-2021-36380 is a critical vulnerability published on August 13, 2021. Sunhillo SureLine before 8.7.0.1.1 allows Unauthenticated OS Command Injection via shell metacharacters in ipAddr or dnsAddr /cgi/networkDiag.cgi.
When was CVE-2021-36380 disclosed?
CVE-2021-36380 was first published in the National Vulnerability Database on August 13, 2021, with the most recent update on November 5, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-36380 actively exploited?
Yes. CISA added CVE-2021-36380 to the Known Exploited Vulnerabilities catalog on March 5, 2024, affecting Sunhillo SureLine. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-36380?
CVE-2021-36380 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2021-36380?
CVE-2021-36380 affects Sunhillo SureLine. 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-2021-36380?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-36380, 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-2021-36380

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