# Firefox OS vulnerabilities > Firefox OS is made by Mozilla. We track 14 published vulnerabilities in it, across 2 versions. 1 of them is on the list of flaws known to be exploited, the newest added on 25 May 2022. If you run Firefox OS, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/mozilla/firefox_os ## At a glance - **Made by:** [Mozilla](https://www.precursorintelligence.com/vendors/mozilla) - **Published vulnerabilities:** 14 - **Known to be exploited:** 1 - **Versions tracked:** 2 - **Most recently added to the known-exploited list:** [CVE-2015-4495](https://www.precursorintelligence.com/what-is/cve-2015-4495), 25 May 2022. We keep watching the list. ## Which versions of Firefox OS do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. "before 2.2" means every version up to, but not including, 2.2. - [CVE-2015-4495](https://www.precursorintelligence.com/what-is/cve-2015-4495) (Mozilla Firefox Security Feature Bypass Vulnerability): before 2.2 ## Which Firefox OS vulnerabilities are being exploited? 1 flaw is on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2015-4495](https://www.precursorintelligence.com/what-is/cve-2015-4495): Mozilla Firefox Security Feature Bypass Vulnerability. High, CVSS 8.8, chance of use in 30 days 69%, known exploited since 25 May 2022. ## Which Firefox OS 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-2015-4000](https://www.precursorintelligence.com/what-is/cve-2015-4000): >99%, Low (CVSS 3.7) - [CVE-2015-4495](https://www.precursorintelligence.com/what-is/cve-2015-4495): 69%, High (CVSS 8.8), known exploited - [CVE-2015-4487](https://www.precursorintelligence.com/what-is/cve-2015-4487): 3.8%, High (CVSS 7.5) - [CVE-2015-4488](https://www.precursorintelligence.com/what-is/cve-2015-4488): 3.8%, High (CVSS 7.5) - [CVE-2015-4489](https://www.precursorintelligence.com/what-is/cve-2015-4489): 3.6%, High (CVSS 7.5) - [CVE-2015-2745](https://www.precursorintelligence.com/what-is/cve-2015-2745): 1.4%, Medium (CVSS 4.3) - [CVE-2015-5962](https://www.precursorintelligence.com/what-is/cve-2015-5962): 1.1%, Medium (CVSS 5.0) - [CVE-2015-2744](https://www.precursorintelligence.com/what-is/cve-2015-2744): 0.8%, Medium (CVSS 4.3) - [CVE-2015-4494](https://www.precursorintelligence.com/what-is/cve-2015-4494): 0.8%, Medium (CVSS 4.3) - [CVE-2015-8510](https://www.precursorintelligence.com/what-is/cve-2015-8510): 0.7%, Medium (CVSS 6.1) ## Questions ### How many vulnerabilities does Firefox OS have? We track 14 published vulnerabilities listed under the name Firefox OS, across 2 versions. The most recent Firefox OS flaw added to the known-exploited list is CVE-2015-4495, on 25 May 2022. ### Which Firefox OS vulnerabilities are being exploited? 1 is on the list of flaws known to be exploited. The most recently added is CVE-2015-4495. ### Which versions of Firefox OS do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2015-4495, affects before 2.2. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Firefox OS? Create a Precursor Intelligence account and track Firefox OS. 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 Firefox OS? 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