What is the CVSS score of CVE-2023-34141?

CVE-2023-34141 has a CVSS 3.1 base score of 8.0 (High). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.6%.

Nxc2500 Firmware CVE-2023-34141

HIGH

OS Command Injection (CWE-78)

2023-07-17 security@zyxel.com.tw

Command Injection Zyxel Zywall Vpn 50 Firmware Zywall Vpn 100 Firmware Zywall Vpn 300 Firmware Usg 2200 Vpn Firmware Usg 20W Vpn Firmware Zywall Vpn100 Firmware Zywall Vpn300 Firmware Usg Flex 100 Firmware Usg Flex 100W Firmware Usg Flex 200 Firmware Usg Flex 500 Firmware Usg Flex 700 Firmware Zywall Atp100 Firmware Zywall Atp100W Firmware Zywall Atp200 Firmware Zywall Atp500 Firmware Zywall Atp700 Firmware Zywall Atp800 Firmware Zywall Vpn50 Firmware Zywall Vpn2S Firmware Usg Flex 50W Firmware Nxc2500 Firmware Nxc5500 Firmware Usg Flex 50 Firmware

8.0

CVSS 3.1 · Vendor: zyxel

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Vulnerability Assessment

Weakness	CWE CWE-78 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization OS command sanitization, avoid shell exec MITRE ATT&CK 2 techniques across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 8.0 (HIGH). Attack characteristics: adjacent network attack vector, low complexity, no privileges required, user interaction required.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to execute arbitrary operating system commands on the host. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.6% exploitation probability (EPSS)

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AnalysisAI

A command injection vulnerability in the access point (AP) management feature of the Zyxel ATP series firmware versions 5.00 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36. Rated high severity (CVSS 8.0), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid passing user input to shell commands. Use language-specific APIs instead of shell execution. Apply strict input validation with allowlists.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as OS Command Injection (CWE-78), which allows attackers to execute arbitrary operating system commands on the host. A command injection vulnerability in the access point (AP) management feature of the Zyxel ATP series firmware versions 5.00 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 5.00 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 5.00 through 5.36 Patch 2, VPN series firmware versions 5.00 through 5.36 Patch 2, NXC2500 firmware versions 6.10(AAIG.0) through 6.10(AAIG.3), and NXC5500 firmware versions 6.10(AAOS.0) through 6.10(AAOS.4), could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device if the attacker could trick an authorized administrator to add their IP address to the managed AP list in advance. Affected products include: Zyxel Usg 20W-Vpn Firmware, Zyxel Usg 2200-Vpn Firmware, Zyxel Usg Flex 100 Firmware, Zyxel Usg Flex 100W Firmware, Zyxel Usg Flex 200 Firmware. Version information: through 5.36.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (zyxel) PRIMARY 8.0 HIGH

AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from Vendor (zyxel) · only source for this CVE.

CVSS VectorVendor: zyxel

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

A command injection vulnerability in the access point (AP) management feature of the Zyxel ATP series firmware versions 5.00 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 5.00 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 5.00 through 5.36 Patch 2, VPN series firmware versions 5.00 through 5.36 Patch 2, NXC2500 firmware versions 6.10(AAIG.0) through 6.10(AAIG.3), and NXC5500 firmware versions 6.10(AAOS.0) through 6.10(AAOS.4), could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device if the attacker could trick an authorized administrator to add their IP address to the managed AP list in advance.

Threat Intelligence Overview

EPSS Score

0.6%

Top 54% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.6%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Controlled

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +40

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

OS Command Injection CRITICAL

OS command injection occurs when an application passes unsanitized user input directly into system shell commands.

Affected Products (CPE)CVE.org

cpe:2.3:o:zyxel:usg_20w-vpn_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_2200-vpn_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_atp100_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_atp100w_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_atp200_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_atp500_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_atp700_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_atp800_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_vpn2s_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_vpn50_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:zywall_vpn_100_firmware:*:*:*:*:*:*:*:*

+ 4 more

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References

Advisories & patches

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

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

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