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CVE-2021-43448

19
FAUCET Score

CVE-2021-43448 affects all versions of ONLYOFFICE as of November 8, 2021, stemming from improper input validation. This medium-severity vulnerability (CVSS 5.3) allows an unauthenticated attacker, with knowledge of a document's ID, to spoof user names during document interaction, requiring user interaction and having a high impact on integrity. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

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

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.01%
Probability of exploitation in next 30 days
EPSS Percentile
59.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0101 is in the 73rd percentile among its peer group of 705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.2 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 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