What is the CVSS score of CVE-2026-25857?

CVE-2026-25857 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.4%.

Is there a public PoC exploit available for CVE-2026-25857?

Yes, a public proof-of-concept exploit is available for CVE-2026-25857. Prioritise patching immediately. EPSS: 0.4%.

How to fix or mitigate CVE-2026-25857?

Within 24 hours: Identify all Tenda G300-F devices in production and isolate or restrict WAN diagnostic access via firewall rules. Within 7 days: Contact Tenda for firmware availability timeline and evaluate alternative router deployment for critical network segments. Within 30 days: Replace affected devices with patched firmware once available, or migrate to alternative vendor hardware if patch timeline is unacceptable.

G300 F Firmware CVE-2026-25857

HIGH

OS Command Injection (CWE-78)

2026-02-07 disclosure@vulncheck.com

Command Injection Tenda G300 F Firmware

8.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Access Tenda G300-F management interface
Exploit

Navigate to WAN diagnostic form
Execution

Inject shell metacharacters in input field
Impact

Execute arbitrary OS commands as management process

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
Exploitation Conditions	Authenticated access to Tenda G300-F router management interface (firmware 16.01.14.2 or prior); WAN diagnostic functionality (formSetWanDiag) must be accessible; attacker requires valid login credentials to management portal
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network. Public exploit/POC available.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to compromise the affected system.

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

No patch listed yet 0.4% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Unauthenticated command injection in Tenda G300-F router firmware version 16.01.14.2 and earlier allows authenticated attackers to execute arbitrary OS commands through the WAN diagnostic interface by injecting shell metacharacters into unvalidated curl parameters. An attacker with management interface access can exploit this to gain full system compromise with process-level privileges. Public exploit code exists and no patch is currently available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 8.8

Tenda G300-F router firmware version 16.01.14.2 and prior contain an OS command injection vulnerability in the WAN diagnostic functionality (formSetWanDiag). [CVSS 8.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

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

Classified as CWE-78 (OS Command Injection). Affects the WAN diagnostic component of G300-F Firmware. Tenda G300-F router firmware version 16.01.14.2 and prior contain an OS command injection vulnerability in the WAN diagnostic functionality (formSetWanDiag). The implementation constructs a shell command that invokes curl and incorporates attacker-controlled input into the command line without adequate neutralization. As a result, a remote attacker with access to the affected management interface can inject additional shell syntax and execute arbitrary commands on the device with the privileges

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

AV:N/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

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Mar 05, 2026 - 20:33 vuln.today

Public exploit code

CVE Published

Feb 07, 2026 - 22:16 nvd

HIGH 8.8

DescriptionCVE.org

Tenda G300-F router firmware version 16.01.14.2 and prior contain an OS command injection vulnerability in the WAN diagnostic functionality (formSetWanDiag). The implementation constructs a shell command that invokes curl and incorporates attacker-controlled input into the command line without adequate neutralization. As a result, a remote attacker with access to the affected management interface can inject additional shell syntax and execute arbitrary commands on the device with the privileges of the management process.

Executive ViewAI

Why It Matters

Tenda G300-F routers running firmware 16.01.14.2 and earlier are vulnerable to remote command execution through the WAN diagnostic feature, allowing unauthenticated attackers to gain full control of affected devices. Organizations using these routers for network access face immediate risk of infrastructure compromise, data interception, and lateral network movement.

Business Impact: High

Compensating Controls

Disable WAN diagnostic functionality if accessible via device administration interface; implement network segmentation to restrict router management access to authorized administrative networks only; deploy WAF or IDS/IPS rules to block malicious requests to /goform/formSetWanDiag endpoint; restrict external access to router management interfaces; monitor for suspicious diagnostic feature usage patterns.

Threat Intelligence Overview

EPSS Score

0.4%

Top 40% exploitable

Exploit

POC

Public exploit code exists

Data Quality

3 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 Yes

EPSS 0.4%

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.