CVE-2023-22915
7.5 · HIGHOverview
CVE-2023-22915 is a high-severity vulnerability affecting zyxel usg_flex_100_firmware. It was published on April 24, 2023 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
A buffer overflow vulnerability in the “fbwifi_forward.cgi” CGI program of Zyxel USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.30 through 5.35, USG20(W)-VPN firmware versions 4.30 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could allow a remote unauthenticated attacker to cause DoS conditions by sending a crafted HTTP request if the Facebook WiFi function were enabled on an affected device.
Remediation
Check the references section for vendor advisories and patches from zyxel. Update usg_flex_100_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| zyxel | usg_flex_100_firmware | 4.50 | Affected |
| zyxel | usg_flex_100w_firmware | 4.50 | Affected |
| zyxel | usg_flex_200_firmware | 4.50 | Affected |
| zyxel | usg_flex_50_firmware | 4.50 | Affected |
| zyxel | usg_flex_50w_firmware | 4.30 | Affected |
| zyxel | usg_flex_500_firmware | 4.50 | Affected |
| zyxel | usg_flex_700_firmware | 4.50 | Affected |
| zyxel | vpn100_firmware | 4.50 | Affected |
| zyxel | vpn1000_firmware | 4.50 | Affected |
| zyxel | vpn300_firmware | 4.50 | Affected |
Frequently Asked Questions
What is CVE-2023-22915?
CVE-2023-22915 is a high-severity vulnerability affecting zyxel usg_flex_100_firmware. It was published on April 24, 2023 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2023-22915?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2023-22915?
Check the references section for vendor advisories and patches from zyxel. Update usg_flex_100_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2023-22915?
CyberStrike's AI-powered security agents can automatically detect CVE-2023-22915 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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