CVE-2023-33011

17.07.2023, 18:15

A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2,  USG FLEX 50(W) series firmware versions 5.10 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 5.10 through 5.36 Patch 2, and VPN series firmware versions 5.00 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands by using a crafted PPPoE configuration on an affected device when the cloud management mode is enabled.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	8.8 HIGH	ADJACENT_NETWORK	LOW	NONE	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Affected Products (NVD)

Vendor	Product	Version
zyxel	usg_2200-vpn_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	usg_flex_100_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	usg_flex_100w_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	usg_flex_200_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	usg_flex_50_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	usg_flex_500_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	usg_flex_50w_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	usg_flex_700_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	zywall_vpn100_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	zywall_vpn2s_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	zywall_vpn300_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	zywall_vpn50_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	zywall_vpn_100_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	zywall_vpn_300_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	zywall_vpn_50_firmware	5.00 ≤ 𝑥 < 5.37
zyxel	usg_20w-vpn_firmware	5.10 ≤ 𝑥 < 5.37
zyxel	zywall_atp100_firmware	5.10 ≤ 𝑥 < 5.37
zyxel	zywall_atp100w_firmware	5.10 ≤ 𝑥 < 5.37
zyxel	zywall_atp200_firmware	5.10 ≤ 𝑥 < 5.37
zyxel	zywall_atp500_firmware	5.10 ≤ 𝑥 < 5.37
zyxel	zywall_atp700_firmware	5.10 ≤ 𝑥 < 5.37
zyxel	zywall_atp800_firmware	5.10 ≤ 𝑥 < 5.37

𝑥

= Vulnerable software versions

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
zyxel	vpn_series_firmware	5.00 ≤ 𝑥 ≤ 5.36_patch_2	ADP
zyxel	atp100_firmware	5.10 ≤ 𝑥 ≤ 5.36_patch_2	ADP
zyxel	usg_flex_series_firmware	5.0.0 ≤ 𝑥 ≤ 5.36_patch_2	ADP
zyxel	usg_flex_50\/w\/_series_firmware	5.10 ≤ 𝑥 ≤ 5.36_patch_2	ADP
zyxel	usg20w-vpn_firmware	5.10 ≤ 𝑥 ≤ 5.36_patch_2	ADP

Common Weakness Enumeration

CWE-134 - Use of Externally-Controlled Format String
The software uses a function that accepts a format string as an argument, but the format string originates from an external source.

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers