# Usg Flex 100 Firmware vulnerabilities > Usg Flex 100 Firmware is made by Zyxel. We track 30 published vulnerabilities in it, across 10 versions. 4 of them are on the list of flaws known to be exploited, the newest added on 5 June 2023. If you run Usg Flex 100 Firmware, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/zyxel/usg_flex_100_firmware ## At a glance - **Made by:** [Zyxel](https://www.precursorintelligence.com/vendors/zyxel) - **Published vulnerabilities:** 30 - **Known to be exploited:** 4 - **Versions tracked:** 10 - **Most recently added to the known-exploited list:** [CVE-2023-33009](https://www.precursorintelligence.com/what-is/cve-2023-33009), 5 June 2023. We keep watching the list. ## Which versions of Usg Flex 100 Firmware do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. "4.60 to before 5.36" means from 4.60 up to, but not including, 5.36. - [CVE-2023-33009](https://www.precursorintelligence.com/what-is/cve-2023-33009) (Zyxel Multiple Firewalls Buffer Overflow Vulnerability): 4.60 to before 5.36, 5.36, 5.36-patch1 - [CVE-2023-33010](https://www.precursorintelligence.com/what-is/cve-2023-33010) (Zyxel Multiple Firewalls Buffer Overflow Vulnerability): 4.50 to before 5.36, 5.36, 5.36-patch1 - [CVE-2023-28771](https://www.precursorintelligence.com/what-is/cve-2023-28771) (Zyxel Multiple Firewalls OS Command Injection Vulnerability): 4.60 to before 5.36 - [CVE-2020-29583](https://www.precursorintelligence.com/what-is/cve-2020-29583) (Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability): 4.60 ## Which Usg Flex 100 Firmware vulnerabilities are being exploited? 4 flaws are on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2023-33009](https://www.precursorintelligence.com/what-is/cve-2023-33009): Zyxel Multiple Firewalls Buffer Overflow Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 28%, known exploited since 5 June 2023. - [CVE-2023-33010](https://www.precursorintelligence.com/what-is/cve-2023-33010): Zyxel Multiple Firewalls Buffer Overflow Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 29%, known exploited since 5 June 2023. - [CVE-2023-28771](https://www.precursorintelligence.com/what-is/cve-2023-28771): Zyxel Multiple Firewalls OS Command Injection Vulnerability. Critical, CVSS 9.8, chance of use in 30 days >99%, known exploited since 31 May 2023. - [CVE-2020-29583](https://www.precursorintelligence.com/what-is/cve-2020-29583): Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 90%, known exploited since 3 November 2021. ## Which Usg Flex 100 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-2023-28771](https://www.precursorintelligence.com/what-is/cve-2023-28771): >99%, Critical (CVSS 9.8), known exploited - [CVE-2020-29583](https://www.precursorintelligence.com/what-is/cve-2020-29583): 90%, Critical (CVSS 9.8), known exploited ## Questions ### How many vulnerabilities does Usg Flex 100 Firmware have? We track 30 published vulnerabilities listed under the name Usg Flex 100 Firmware, across 10 versions. The most recent Usg Flex 100 Firmware flaw added to the known-exploited list is CVE-2023-33009, on 5 June 2023. ### Which Usg Flex 100 Firmware vulnerabilities are being exploited? 4 are on the list of flaws known to be exploited. The most recently added are CVE-2023-33009, CVE-2023-33010 and CVE-2023-28771. ### Which versions of Usg Flex 100 Firmware do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2023-33009, affects 4.60 to before 5.36, 5.36, 5.36-patch1. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Usg Flex 100 Firmware? Create a Precursor Intelligence account and track Usg Flex 100 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 Usg Flex 100 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