Usg Flex 500 vulnerabilitiesAnd the versions its exploited flaws hit.
Usg Flex 500 is made by Zyxel. We track 54 published vulnerabilities listed under that exact name, across 0 versions. 6 of them are on the list of flaws known to be exploited, the newest added on 3 December 2024. Zyxel lists newer releases under their own names, such as Usg Flex 500 Firmware, so check those pages too.
The most recent Usg Flex 500 flaw added to the known-exploited list is CVE-2024-11667, on 3 December 2024. We keep watching the known-exploited list.
Is Usg Flex 500 listed under other names? Yes.
Zyxel also lists Usg Flex 500 under more specific names, such as Usg Flex 500 Firmware. Flaws listed only under those names are counted on their own pages, not here. If you run one of these, open its page for its own exploited flaws.
Which versions of Usg Flex 500 do the exploited flaws hit?
Each exploited flaw lists the versions it affects, as published by the vendor. Find your version, then patch.
Which Usg Flex 500 vulnerabilities are being exploited?
6 flaws are on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 7.5Zyxel Multiple Firewalls Path Traversal Vulnerability
Multiple Zyxel firewalls contain a path traversal vulnerability in the web management interface that could allow an attacker to download or upload files via a crafted URL.
- 9.8Zyxel Multiple Firewalls Buffer Overflow Vulnerability
Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the notification function that could allow an unauthenticated attacker to cause...
- 9.8Zyxel Multiple Firewalls Buffer Overflow Vulnerability
Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the ID processing function that could allow an unauthenticated attacker to cause...
- 9.8Zyxel Multiple Firewalls OS Command Injection Vulnerability
Zyxel ATP, USG FLEX, VPN, and ZyWALL/USG firewalls allow for improper error message handling which could allow an unauthenticated attacker to execute OS commands remotely by sending crafted packets to an affected device.
- 9.8Zyxel Multiple Firewalls OS Command Injection Vulnerability
A command injection vulnerability in the CGI program of some Zyxel firewall versions could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.
- 9.8Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability
Zyxel firewalls (ATP, USG, VM) and AP Controllers (NXC2500 and NXC5500) contain a use of hard-coded credentials vulnerability in an undocumented account ("zyfwp") with an unchangeable password.
Which Usg Flex 500 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. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- >99%
Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series firmware versions 4.60 through 5.35, and ATP series...
- 90%
Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password.
- 5.5%CVE-2025-9133High
A missing authorization vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.40, USG FLEX series firmware versions from V4.50 through V5.40, USG FLEX 50(W) series firmware versions from V4.16...
Running Usg Flex 500? We'll keep checking.
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1 flaw being exploited affects software Acme tracks
Multiple Zyxel firewalls contain a path traversal vulnerability in the web management interface that could allow an attacker to download or upload files via a crafted URL.
- Matched to
- Usg Flex 500 on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
We track 54 published vulnerabilities listed under the name Usg Flex 500, across 0 versions. The most recent Usg Flex 500 flaw added to the known-exploited list is CVE-2024-11667, on 3 December 2024.
6 are on the list of flaws known to be exploited. The most recently added are CVE-2024-11667, CVE-2023-33009 and CVE-2023-33010.
Zyxel also lists Usg Flex 500 under more specific names, such as Usg Flex 500 Firmware. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list.
Create a Precursor Intelligence account and track Usg Flex 500. 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.