CVE-2021-43448

Name: CVE-2021-43448
Creator: NVD / NIST
Published: 2023-01-23T15:15:13.45+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.01%

Last modified Jun 17, 2026

CVE-2021-43448 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Improper Input Validation. A lack of input validation can allow an attacker to spoof the names of users who interact with a document, if the document id is known.. EPSS estimates a 1.01% chance of exploitation in the next 30 days.

Description

ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Improper Input Validation. A lack of input validation can allow an attacker to spoof the names of users who interact with a document, if the document id is known.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.01%

58.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Onlyoffice	Server	<= 7.0.0.49

References

https://github.com/ONLYOFFICE/serverThird Party Advisory
https://labs.nettitude.com/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution/Exploit, Mitigation, Third Party Advisory
https://www.onlyoffice.com/Product, Vendor Advisory
https://github.com/ONLYOFFICE/serverThird Party Advisory
https://labs.nettitude.com/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution/Exploit, Mitigation, Third Party Advisory
https://www.onlyoffice.com/Product, Vendor Advisory

Timeline

Published: Jan 23, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43448?

How severe is CVE-2021-43448?

CVE-2021-43448 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.01% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43448?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43448?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST