KEV Entry

CVE-2021-21805

Known Exploited Vulnerability Entry External Catalog

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Entry Details
Confirmed Exploited

CVE-2021-21805

2026-06-06 00:00 UTC

Timestamps

2026-06-06

2026-06-06

Scope

KEVIntel entry: An OS Command Injection vulnerability exists in the ping.php script functionality of Advantech R-SeeNet v 2.4.12 (20.10.2020). A specially crafted... | Affected: Advantech / R-SeeNet | CVSS: 9.8 (CRITICAL) | EPSS: 0.69631 | Used in malware: unknown | Not yet in CISA KEV: True

References
  • {'id': 'CVE-2021-21805', 'url': 'https://www.cve.org/CVERecord?id=CVE-2021-21805'}
  • {'id': 'kevintel', 'url': 'https://kevintel.com/vuln/CVE-2021-21805'}

8b40d2f0-45eb-447f-bcf2-f342df7b9dca

caeb2787-0d58-4236-9039-7c86c3e566f3

2026-06-23 14:03 UTC

2026-06-23 14:03 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report kevintel successful_exploitation 0.70
View details 
{
  "added_date": "2026-06-06T00:00:00.000Z",
  "ahead_of_cisa_kev": null,
  "cvss_score": 9.8,
  "cvss_severity": "CRITICAL",
  "epss_percentile": 0.99279,
  "epss_score": 0.69631,
  "feed": "KEVIntel (kevintel.com)",
  "not_yet_in_cisa_kev": true,
  "product": "R-SeeNet",
  "title": "An OS Command Injection vulnerability exists in the ping.php script functionality of Advantech R-SeeNet v 2.4.12 (20.10.2020). A specially crafted...",
  "used_in_malware": "unknown",
  "vendor": "Advantech"
}
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