# Document Server vulnerabilities > Document Server is made by Onlyoffice. We track 19 published vulnerabilities in it, across 93 versions. 1 of them is on the list of flaws known to be exploited, the newest added on 8 October 2026. If you run Document Server, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/onlyoffice/document_server ## At a glance - **Made by:** [Onlyoffice](https://www.precursorintelligence.com/vendors/onlyoffice) - **Published vulnerabilities:** 19 - **Known to be exploited:** 1 - **Versions tracked:** 93 - **Most recently added to the known-exploited list:** [CVE-2021-3199](https://www.precursorintelligence.com/what-is/cve-2021-3199), 8 October 2026. We keep watching the list. ## Which versions of Document Server do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. "before 5.6.3" means every version up to, but not including, 5.6.3. - [CVE-2021-3199](https://www.precursorintelligence.com/what-is/cve-2021-3199) (ONLYOFFICE Docs Server Path Traversal Vulnerability): before 5.6.3 ## Which Document Server vulnerabilities are being exploited? 1 flaw is on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2021-3199](https://www.precursorintelligence.com/what-is/cve-2021-3199): ONLYOFFICE Docs Server Path Traversal Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 19%, known exploited since 8 October 2026. ## Which Document Server flaws are most likely to be used? Ranked by the latest exploit-likelihood forecast (the chance each flaw is used in an attack in the next 30 days): - [CVE-2021-25833](https://www.precursorintelligence.com/what-is/cve-2021-25833): 44%, Critical (CVSS 9.8) - [CVE-2021-3199](https://www.precursorintelligence.com/what-is/cve-2021-3199): 19%, Critical (CVSS 9.8), known exploited - [CVE-2021-25832](https://www.precursorintelligence.com/what-is/cve-2021-25832): 13%, Critical (CVSS 9.8) - [CVE-2021-25830](https://www.precursorintelligence.com/what-is/cve-2021-25830): 12%, Critical (CVSS 9.8) - [CVE-2021-25831](https://www.precursorintelligence.com/what-is/cve-2021-25831): 12%, Critical (CVSS 9.8) - [CVE-2021-25829](https://www.precursorintelligence.com/what-is/cve-2021-25829): 7.4%, High (CVSS 7.5) - [CVE-2022-29776](https://www.precursorintelligence.com/what-is/cve-2022-29776): 6.9%, Critical (CVSS 9.8) - [CVE-2022-29777](https://www.precursorintelligence.com/what-is/cve-2022-29777): 6.9%, Critical (CVSS 9.8) - [CVE-2020-11536](https://www.precursorintelligence.com/what-is/cve-2020-11536): 2.6%, Critical (CVSS 9.8) - [CVE-2023-30187](https://www.precursorintelligence.com/what-is/cve-2023-30187): 2.4%, Critical (CVSS 9.8) ## Questions ### How many vulnerabilities does Document Server have? We track 19 published vulnerabilities listed under the name Document Server, across 93 versions. The most recent Document Server flaw added to the known-exploited list is CVE-2021-3199, on 8 October 2026. ### Which Document Server vulnerabilities are being exploited? 1 is on the list of flaws known to be exploited. The most recently added is CVE-2021-3199. ### Which versions of Document Server do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2021-3199, affects before 5.6.3. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Document Server? Create a Precursor Intelligence account and track Document Server. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook. ## Running Document Server? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact