KEV Entry

CVE-2021-3199

Known Exploited Vulnerability Entry Previdian

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Entry Details
Confirmed Exploited

CVE-2021-3199

2026-10-08 17:40 UTC

Timestamps

2026-10-08

2026-10-08

Scope

Directory traversal with remote code execution can occur in /upload in ONLYOFFICE Document Server before 5.6.3, when JWT is used, via a /..... | Affected: Onlyoffice / Document Server | CVSS: 9.8 (CRITICAL) | EPSS: 0.08215 | Used in malware: unknown | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2021-3199', 'url': 'https://www.cve.org/CVERecord?id=CVE-2021-3199'}
  • {'id': 'previdian', 'url': 'https://previdian.com/CVE-2021-3199'}

b595ae6e-79f5-4edb-ba91-cbc3b9b8c12f

Previdian
caeb2787-0d58-4236-9039-7c86c3e566f3

2026-10-09 06:14 UTC

2026-10-09 06:14 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report previdian successful_exploitation 0.70
View details 
{
  "added_date": "2026-10-08T17:40:54.331Z",
  "ahead_of_cisa_kev": null,
  "cve_id": "CVE-2021-3199",
  "cvss_estimated": false,
  "cvss_score": 9.8,
  "cvss_severity": "CRITICAL",
  "epss_percentile": 0.9475,
  "epss_score": 0.08215,
  "feed": "Previdian (previdian.com)",
  "ghsa_id": null,
  "not_yet_in_cisa_kev": false,
  "previous_ids": [],
  "product": "Document Server",
  "title": "Directory traversal with remote code execution can occur in /upload in ONLYOFFICE Document Server before 5.6.3, when JWT is used, via a /.....",
  "used_in_malware": "unknown",
  "vendor": "Onlyoffice",
  "virtual_patch": false,
  "vulnerability_id": "CVE-2021-3199"
}
 -
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