CVE-2021-3199（onlyoffice document server）の深刻度・悪用状況・対象バージョン
9.8 緊急（CVSS 3.x） 悪用確認済み（CISA KEV） EPSS 取得中…
概要
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.
実際の攻撃で悪用されています。 CISA KEV への追加日: 2026-10-08。対象製品を使っている場合は最優先で対策してください。
CISA の要求対応: 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.
CISA の要求対応: 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.
影響を受ける製品
| ベンダー | 製品 | 対象バージョン |
|---|---|---|
| onlyoffice | document_server | < 5.6.3 |
基本情報
- 公開日
- 2021-01-26
- 最終更新
- 2026-10-09
- NVD の状態
- Analyzed
- 弱点の種類
- CWE-22
対策の進め方
- 上の表で、使っている製品とバージョンが対象か確認します。
- ベンダーの公式アドバイザリ（下の参考情報の「Vendor Advisory」「Patch」）で修正版・回避策を確認します。
- 悪用が確認されているため、パッチ適用までの間もアクセス制限・侵害の痕跡確認を検討します。
- 日本語の情報は JVN iPedia で CVE-2021-3199 を検索 できます。
参考情報
- https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 Release NotesThird Party Advisory
- https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py ExploitThird Party Advisory
- https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py ExploitThird Party Advisory
- https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 Release NotesThird Party Advisory
- https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py ExploitThird Party Advisory
- https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py ExploitThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3199 US Government Resource
- NVD: CVE-2021-3199
- CVE.org: CVE-2021-3199
データ出典: NIST NVD、CISA KEV、FIRST EPSS。翻訳は参考情報で、正確性は原文を優先してください。