# Fabric Operating System vulnerabilities > Fabric Operating System is made by Brocade. We track 10 published vulnerabilities in it, across 5 versions. 1 of them is on the list of flaws known to be exploited, the newest added on 6 October 2025. If you run Fabric Operating System, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/brocade/fabric_operating_system ## At a glance - **Made by:** [Brocade](https://www.precursorintelligence.com/vendors/brocade) - **Published vulnerabilities:** 10 - **Known to be exploited:** 1 - **Versions tracked:** 5 - **Most recently added to the known-exploited list:** [CVE-2021-22555](https://www.precursorintelligence.com/what-is/cve-2021-22555), 6 October 2025. We keep watching the list. ## Which Fabric Operating System vulnerabilities are being exploited? 1 flaw is on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2021-22555](https://www.precursorintelligence.com/what-is/cve-2021-22555): Linux Kernel Heap Out-of-Bounds Write Vulnerability. High, CVSS 7.8, chance of use in 30 days 79%, known exploited since 6 October 2025. ## Which Fabric Operating System 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-2021-22555](https://www.precursorintelligence.com/what-is/cve-2021-22555): 79%, High (CVSS 7.8), known exploited - [CVE-2022-27776](https://www.precursorintelligence.com/what-is/cve-2022-27776): 4.1%, Medium (CVSS 6.5) - [CVE-2022-27775](https://www.precursorintelligence.com/what-is/cve-2022-27775): 3.3%, High (CVSS 7.5) - [CVE-2022-22576](https://www.precursorintelligence.com/what-is/cve-2022-22576): 2.5%, High (CVSS 8.1) - [CVE-2022-27774](https://www.precursorintelligence.com/what-is/cve-2022-27774): 2.0%, Medium (CVSS 5.7) - [CVE-2020-13630](https://www.precursorintelligence.com/what-is/cve-2020-13630): 1.0%, High (CVSS 7.0) - [CVE-2020-13631](https://www.precursorintelligence.com/what-is/cve-2020-13631): 0.7%, Medium (CVSS 5.5) - [CVE-2020-13632](https://www.precursorintelligence.com/what-is/cve-2020-13632): 0.6%, Medium (CVSS 5.5) - [CVE-2023-4162](https://www.precursorintelligence.com/what-is/cve-2023-4162): 0.2%, Medium (CVSS 4.4) ## Questions ### How many vulnerabilities does Fabric Operating System have? We track 10 published vulnerabilities listed under the name Fabric Operating System, across 5 versions. The most recent Fabric Operating System flaw added to the known-exploited list is CVE-2021-22555, on 6 October 2025. ### Which Fabric Operating System vulnerabilities are being exploited? 1 is on the list of flaws known to be exploited. The most recently added is CVE-2021-22555. ### How do I get alerts for Fabric Operating System? Create a Precursor Intelligence account and track Fabric Operating System. 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 Fabric Operating System? 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