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
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 98%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.

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 PROB
98%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

August 13, 2021

Last Modified

November 5, 2025

Advisory Details (3)

Auto-updated Sep 24, 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 54× 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 792 total refreshes for this CVE.

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

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