KEV Entry

CVE-2021-3199

Known Exploited Vulnerability Entry CISA

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Entry Details
Confirmed Exploited

CVE-2021-3199

2026-10-08 02:00 CEST

Timestamps

2026-10-08

2026-10-08

Scope

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

References
  • {'id': 'CVE-2021-3199', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-3199'}

8a6d0c24-ca36-47ae-a962-195ce74adb6c

CISA
405284c2-e461-4670-8979-7fd2c9755a60

2026-10-09 06:23 CEST

2026-10-09 06:23 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-22"
  ],
  "date_added": "2026-10-08",
  "due_date": "2026-10-11",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Docs",
  "vendorProject": "ONLYOFFICE",
  "vulnerabilityName": "ONLYOFFICE Docs Server Path Traversal Vulnerability"
}
 -
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