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HIGH · 7.5

CVE-2023-22915

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 f...

Vulnerability 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.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
ZyxelUsg Flex 100 Firmware>= 4.50, <= 5.35
ZyxelUsg Flex 100-
ZyxelUsg Flex 100W Firmware>= 4.50, <= 5.35
ZyxelUsg Flex 100W-
ZyxelUsg Flex 200 Firmware>= 4.50, <= 5.35
ZyxelUsg Flex 200-
ZyxelUsg Flex 50 Firmware>= 4.50, <= 5.35
ZyxelUsg Flex 50-
ZyxelUsg Flex 50W Firmware>= 4.30, <= 5.35
ZyxelUsg Flex 50W-
ZyxelUsg Flex 500 Firmware>= 4.50, <= 5.35
ZyxelUsg Flex 500-
ZyxelUsg Flex 700 Firmware>= 4.50, <= 5.35
ZyxelUsg Flex 700-
ZyxelVpn100 Firmware>= 4.50, <= 5.35
ZyxelVpn100-
ZyxelVpn1000 Firmware>= 4.50, <= 5.35
ZyxelVpn1000-
ZyxelVpn300 Firmware>= 4.50, <= 5.35
ZyxelVpn300-

Related Weaknesses (CWE)

CWE-120

References

FAQ

What is CVE-2023-22915?

CVE-2023-22915 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 f...

How severe is CVE-2023-22915?

CVE-2023-22915 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2023-22915?

Check the references section above for vendor advisories and patch information. Affected products include: Zyxel Usg Flex 100 Firmware, Zyxel Usg Flex 100, Zyxel Usg Flex 100W Firmware, Zyxel Usg Flex 100W, Zyxel Usg Flex 200 Firmware.