CVE-2021-3199

Exploitation active confirmée

Ajoutée au catalogue CISA KEV le 08/10/2026, correctif exigé avant le 11/10/2026 pour les agences fédérales américaines.

Action requise : 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.

Description officielle (NVD)

Directory traversal with remote code execution can occur in /upload in ONLYOFFICE Document Server before 5.6.3, when JWT is used, via a /.. sequence in an image upload parameter.

Références

• https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 — Release Notes, Third Party Advisory
• https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py — Exploit, Third Party Advisory
• https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py — Exploit, Third Party Advisory
• https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 — Release Notes, Third Party Advisory
• https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py — Exploit, Third Party Advisory
• https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py — Exploit, Third Party Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3199 — US Government Resource

En bref

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Produits concernés

Sources officielles

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