What is the CVSS score of CVE-2022-26413?

CVE-2022-26413 has a CVSS 3.1 base score of 8.0 (High). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.7%.

Emg3525 T50b Firmware CVE-2022-26413

HIGH

OS Command Injection (CWE-78)

2022-04-11 security@zyxel.com.tw

Command Injection Zyxel Emg3525 T50b Firmware Emg5523 T50b Firmware Emg6726 B10a Firmware Ex3510 B0 Firmware Pm7300 T0 Firmware Vmg3625 T50b Firmware Vmg4927 B50a Firmware Vmg8623 T50b Firmware Dx5401 B0 Firmware Ex5401 B0 Firmware Ex5501 B0 Firmware Emg5723 T50K Firmware Vmg3927 B50B Firmware Vmg3927 T50K Firmware Vmg8825 T50K Firmware Ax7501 B0 Firmware Ep240P Firmware Pmg5317 T20B Firmware Pmg5617 T20B2 Firmware Pmg5617Ga Firmware Pmg5622Ga Firmware Vmg3312 T20A Firmware Vmg1312 T20B Firmware Vmg3927 B50A Firmware Vmg3927 B60A Firmware Vmg8825 B50A Firmware Vmg8825 B50B Firmware Vmg8825 B60A Firmware Vmg8825 B60B Firmware Xmg3927 B50A Firmware Xmg8825 B50A Firmware Px7501 B0 Firmware

8.0

CVSS 3.1 · NVD

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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, low privileges required, no user interaction not required.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to execute arbitrary operating system commands on the host.

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

No patch listed yet 0.7% exploitation probability (EPSS)

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AnalysisAI

A command injection vulnerability in the CGI program of Zyxel VMG3312-T20A firmware version 5.30(ABFX.5)C0 could allow a local authenticated attacker to execute arbitrary OS commands on a vulnerable. Rated high severity (CVSS 8.0), this vulnerability is 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 CGI program of Zyxel VMG3312-T20A firmware version 5.30(ABFX.5)C0 could allow a local authenticated attacker to execute arbitrary OS commands on a vulnerable device via a LAN interface. Affected products include: Zyxel Vmg3312-T20A Firmware, Zyxel Emg3525-T50B Firmware, Zyxel Emg5523-T50B Firmware, Zyxel Emg5723-T50K Firmware, Zyxel Emg6726-B10A Firmware. Version information: version 5.30.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.0 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

Threat Intelligence Overview

EPSS Score

0.7%

Top 52% 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 0.7%

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)NVD

cpe:2.3:o:zyxel:vmg3312-t20a_firmware:5.30\(abfx.5\)c0:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:america:*:*:*

cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:emea:*:*:*

cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:america:*:*:*

cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:emea:*:*:*

cpe:2.3:o:zyxel:emg5723-t50k_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:emg6726-b10a_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg1312-t20b_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg3625-t50b_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg3927-b50a_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg3927-b50b_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg3927-b60a_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg3927-t50k_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg4927-b50a_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg8623-t50b_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg8825-b50a_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg8825-b50b_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg8825-t50k_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg8825-b60a_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:vmg8825-b60b_firmware:*:*:*:*:*:*:*:*

+ 14 more

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References

Advisories & patches

ADVISORY https://www.zyxel.com/support/OS-command-injection-and-buffer-overflow-vulnerabilities-of-CPE-and-ONTs.shtml

Search Externally

GitHub PoC

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