CVE-2021-3199

At a glance

Severity: CRITICAL 9.8
Exploitation: Known exploited (CISA KEV) · added 2026-10-08
Exploited per ENISA since 2026-10-08
EPSS: EPSS 30.24 % · percentile 98 (2026-10-27)
State: PUBLISHED
Published: 2021-01-22
Updated: 2026-10-09
Assigner: mitre
NVD status: Analyzed

Description

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
CVSS 2.0	HIGH 7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-22

European references

ENISA EUVD · EUVD-2021-26539
GCVE · GCVE-0-2021-3199

Affected configurations (NVD CPE)

cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:* < 5.6.3

Affected products

Product	Versions
	affected n/a

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
CISA Known Exploited Vulnerabilities	CC0 1.0
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD