Vulnerability Description
A format string vulnerability in a function of the IPSec VPN feature in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 through 5.37 Patch 1, USG FLEX 50(W) series firmware versions from 4.16 through 5.37 Patch 1, and USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1 could allow an attacker to achieve unauthorized remote code execution by sending a sequence of specially crafted payloads containing an invalid pointer; however, such an attack would require detailed knowledge of an affected device’s memory layout and configuration.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | Atp100 Firmware | >= 4.32, < 5.37 |
| Zyxel | Atp100 | - |
| Zyxel | Atp100W Firmware | >= 4.32, < 5.37 |
| Zyxel | Atp100W | - |
| Zyxel | Atp200 Firmware | >= 4.32, < 5.37 |
| Zyxel | Atp200 | - |
| Zyxel | Atp500 Firmware | >= 4.32, < 5.37 |
| Zyxel | Atp500 | - |
| Zyxel | Atp700 Firmware | >= 4.32, < 5.37 |
| Zyxel | Atp700 | - |
| Zyxel | Atp800 Firmware | >= 4.32, < 5.37 |
| Zyxel | Atp800 | - |
| Zyxel | Usg Flex 100 Firmware | >= 4.50, < 5.37 |
| Zyxel | Usg Flex 100 | - |
| Zyxel | Usg Flex 100Ax Firmware | >= 4.50, < 5.37 |
| Zyxel | Usg Flex 100Ax | - |
| Zyxel | Usg Flex 100H Firmware | >= 4.50, < 5.37 |
| Zyxel | Usg Flex 100H | - |
| Zyxel | Usg Flex 100W Firmware | >= 4.50, < 5.37 |
| Zyxel | Usg Flex 100W | - |
Related Weaknesses (CWE)
References
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisVendor Advisory
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisVendor Advisory
FAQ
What is CVE-2023-6764?
CVE-2023-6764 is a vulnerability with a CVSS score of 8.1 (HIGH). A format string vulnerability in a function of the IPSec VPN feature in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 throu...
How severe is CVE-2023-6764?
CVE-2023-6764 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-6764?
Check the references section above for vendor advisories and patch information. Affected products include: Zyxel Atp100 Firmware, Zyxel Atp100, Zyxel Atp100W Firmware, Zyxel Atp100W, Zyxel Atp200 Firmware.