Vulnerability · Published Feb 20, 2024 · Assigned by Zyxel
CVE-2023-6764
High 8.1
In plain English
A high-severity security flaw in ATP series firmware from Zyxel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | ATP series firmware | version 4.32 through 5.37 Patch 1 |
| Zyxel | USG FLEX series firmware | version 4.50 through 5.37 Patch 1 |
| Zyxel | USG FLEX 50(W) series firmware | version 4.16 through 5.37 Patch 1 |
| Zyxel | USG20(W)-VPN series firmware | version 4.16 through 5.37 Patch 1 |
Weakness: CWE-134 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H