CVE-2023-6764

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

Product

Zyxel Atp100 Firmware

PublishedFeb 20, 2024

First seenFeb 20, 2024

Weakness typeCWE-134CWE-134

How to fix

Update

zyxel atp100_firmware5.37 or later
zyxel atp100w_firmware5.37 or later
zyxel atp200_firmware5.37 or later
zyxel atp500_firmware5.37 or later
zyxel atp700_firmware5.37 or later
zyxel atp800_firmware5.37 or later
zyxel usg_flex_100_firmware5.37 or later
zyxel usg_flex_100ax_firmware5.37 or later
zyxel usg_flex_100h_firmware5.37 or later
zyxel usg_flex_100w_firmware5.37 or later
zyxel usg_flex_200_firmware5.37 or later
zyxel usg_flex_200h_firmware5.37 or later

Vendor advisories

zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024

Affected products

Product	Affected versions	Fixed in
zyxel atp100_firmware	4.32 ≤ v < 5.37, 5.37	5.37
zyxel atp100w_firmware	4.32 ≤ v < 5.37, 5.37	5.37
zyxel atp200_firmware	4.32 ≤ v < 5.37, 5.37	5.37
zyxel atp500_firmware	4.32 ≤ v < 5.37, 5.37	5.37
zyxel atp700_firmware	4.32 ≤ v < 5.37, 5.37	5.37
zyxel atp800_firmware	4.32 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_100_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_100ax_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_100h_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_100w_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_200_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_200h_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_200hp_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_500_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_500h_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_700_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_700h_firmware	4.50 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_50_firmware	4.16 ≤ v < 5.37, 5.37	5.37
zyxel usg_flex_50w_firmware	4.16 ≤ v < 5.37, 5.37	5.37
zyxel usg20-vpn_firmware	4.16 ≤ v < 5.37, 5.37	5.37
zyxel usg20w-vpn_firmware	4.16 ≤ v < 5.37, 5.37	5.37

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