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CVE-2021-43447

24
FAUCET Score

CVE-2021-43447 describes an Incorrect Access Control vulnerability affecting all versions of ONLYOFFICE Server as of November 8, 2021, allowing unauthenticated document editing. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network without user interaction, leading to high integrity impact. While no public exploits or active exploitation have been observed, and community discussion is minimal, the potential for unauthorized document modification remains a significant risk.

Impacted Technologies

VendorProductVersion(s)CPE
<= 7.0.0.49CPE matchmatch criteria
cpe:2.3:a:onlyoffice:server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.25%
Probability of exploitation in next 30 days
EPSS Percentile
66.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0125 is in the 46th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / ONLYOFFICE/server
Third Party Advisory
labs.nettitude.com / blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution
ExploitMitigationThird Party Advisory
onlyoffice.com
ProductVendor Advisory