cve-2021-3199

{
  "cvss": 9.8,
  "datePublished": "2026-10-08",
  "dateUpdated": "2026-10-08",
  "description": "ONLYOFFICE Docs Server Path Traversal Vulnerability | Affected: ONLYOFFICE / Docs | Description: ONLYOFFICE Docs contains a path traversal vulnerability that can occur when JWT is used, via a /.. sequence in an image upload parameter and could allow for remote code execution. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-10-11 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2021-3199",
  "dueDate": "2026-10-11",
  "exploited": true,
  "id": "CVE-2021-3199",
  "kev_catalogs": [
    "circl"
  ],
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Docs",
  "severity": "CRITICAL",
  "source": "circl_kev",
  "title": "ONLYOFFICE Docs Server Path Traversal Vulnerability",
  "vendor": "ONLYOFFICE"
}