# Nas540 Firmware vulnerabilities > Nas540 Firmware is made by Zyxel. We track 5 published vulnerabilities in it, across 5 versions. 2 of them are on the list of flaws known to be exploited, the newest added on 23 June 2023. If you run Nas540 Firmware, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/zyxel/nas540_firmware ## At a glance - **Made by:** [Zyxel](https://www.precursorintelligence.com/vendors/zyxel) - **Published vulnerabilities:** 5 - **Known to be exploited:** 2 - **Versions tracked:** 5 - **Most recently added to the known-exploited list:** [CVE-2023-27992](https://www.precursorintelligence.com/what-is/cve-2023-27992), 23 June 2023. We keep watching the list. ## Which versions of Nas540 Firmware do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. "before 5.21(aatb.11)c0" means every version up to, but not including, 5.21(aatb.11)c0. - [CVE-2023-27992](https://www.precursorintelligence.com/what-is/cve-2023-27992) (Zyxel Multiple NAS Devices Command Injection Vulnerability): before 5.21(aatb.11)c0 - [CVE-2020-9054](https://www.precursorintelligence.com/what-is/cve-2020-9054) (Zyxel Multiple NAS Devices OS Command Injection Vulnerability): before 5.21(aatb.4)c0 ## Which Nas540 Firmware vulnerabilities are being exploited? 2 flaws are on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2023-27992](https://www.precursorintelligence.com/what-is/cve-2023-27992): Zyxel Multiple NAS Devices Command Injection Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 83%, known exploited since 23 June 2023. - [CVE-2020-9054](https://www.precursorintelligence.com/what-is/cve-2020-9054): Zyxel Multiple NAS Devices OS Command Injection Vulnerability. Critical, CVSS 9.8, chance of use in 30 days >99%, known exploited since 25 March 2022. ## Which Nas540 Firmware 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-2020-9054](https://www.precursorintelligence.com/what-is/cve-2020-9054): >99%, Critical (CVSS 9.8), known exploited - [CVE-2023-27992](https://www.precursorintelligence.com/what-is/cve-2023-27992): 83%, Critical (CVSS 9.8), known exploited - [CVE-2023-27988](https://www.precursorintelligence.com/what-is/cve-2023-27988): 1.4%, High (CVSS 7.2) - [CVE-2020-13364](https://www.precursorintelligence.com/what-is/cve-2020-13364): 1.2%, High (CVSS 8.8) - [CVE-2020-13365](https://www.precursorintelligence.com/what-is/cve-2020-13365): 1.0%, High (CVSS 8.8) ## Questions ### How many vulnerabilities does Nas540 Firmware have? We track 5 published vulnerabilities listed under the name Nas540 Firmware, across 5 versions. The most recent Nas540 Firmware flaw added to the known-exploited list is CVE-2023-27992, on 23 June 2023. ### Which Nas540 Firmware vulnerabilities are being exploited? 2 are on the list of flaws known to be exploited. The most recently added are CVE-2023-27992 and CVE-2020-9054. ### Which versions of Nas540 Firmware do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2023-27992, affects before 5.21(aatb.11)c0. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Nas540 Firmware? Create a Precursor Intelligence account and track Nas540 Firmware. 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 Nas540 Firmware? 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