CVE-2023-34139 : A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4

A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.

Published 2023-07-17 18:15:10

Updated 2023-07-26 21:30:23

Source Zyxel Corporation

View at NVD, CVE.org

Products affected by CVE-2023-34139

Zyxel » Zywall Vpn 50 Firmware
Versions from including (>=) 4.20 and before (<) 5.37
cpe:2.3:o:zyxel:zywall_vpn_50_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn 50 » Version: N/A
Zyxel » Zywall Vpn 100 Firmware
Versions from including (>=) 4.20 and before (<) 5.37
cpe:2.3:o:zyxel:zywall_vpn_100_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn 100 » Version: N/A
Zyxel » Zywall Vpn 300 Firmware
Versions from including (>=) 4.20 and before (<) 5.37
cpe:2.3:o:zyxel:zywall_vpn_300_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn 300 » Version: N/A
Zyxel » Usg 2200-vpn Firmware
Versions from including (>=) 4.20 and before (<) 5.37
cpe:2.3:o:zyxel:usg_2200-vpn_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg 2200-vpn » Version: N/A
Zyxel » Zywall Vpn100 Firmware
Versions from including (>=) 4.20 and before (<) 5.37
cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn100 » Version: N/A
Zyxel » Zywall Vpn300 Firmware
Versions from including (>=) 4.20 and before (<) 5.37
cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn300 » Version: N/A
Zyxel » Usg Flex 100 Firmware
Versions from including (>=) 4.50 and before (<) 5.37
cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 100 » Version: N/A
Zyxel » Usg Flex 200 Firmware
Versions from including (>=) 4.50 and before (<) 5.37
cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 200 » Version: N/A
Zyxel » Usg Flex 500 Firmware
Versions from including (>=) 4.50 and before (<) 5.37
cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 500 » Version: N/A
Zyxel » Usg Flex 100w Firmware
Versions from including (>=) 4.50 and before (<) 5.37
cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 100w » Version: N/A
Zyxel » Usg Flex 700 Firmware
Versions from including (>=) 4.50 and before (<) 5.37
cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 700 » Version: N/A
Zyxel » Zywall Vpn50 Firmware
Versions from including (>=) 4.20 and before (<) 5.37
cpe:2.3:o:zyxel:zywall_vpn50_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn50 » Version: N/A
Zyxel » Zywall Vpn2s Firmware
Versions from including (>=) 4.20 and before (<) 5.37
cpe:2.3:o:zyxel:zywall_vpn2s_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall Vpn2s » Version: N/A
Zyxel » Usg Flex 50w Firmware
Versions from including (>=) 4.50 and before (<) 5.37
cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 50w » Version: N/A
Zyxel » Usg Flex 50 Firmware
Versions from including (>=) 4.50 and before (<) 5.37
cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg Flex 50 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2023-34139

EPSS FAQ

0.05%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 19 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-34139

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
8.8	HIGH	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	2.8	5.9	NIST
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
8.8	HIGH	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	2.8	5.9	Zyxel Corporation
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2023-34139

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
Assigned by:
- nvd@nist.gov (Primary)
- security@zyxel.com.tw (Secondary)

References for CVE-2023-34139

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

Access denied | Zyxel Networks
Vendor Advisory

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Vulnerability Details : CVE-2023-34139

Products affected by CVE-2023-34139

Exploit prediction scoring system (EPSS) score for CVE-2023-34139

CVSS scores for CVE-2023-34139

CWE ids for CVE-2023-34139

References for CVE-2023-34139