What is the CVSS score of EUVD-2025-21098?

EUVD-2025-21098 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 EUVD-2025-21098?

Yes, a public proof-of-concept exploit is available for EUVD-2025-21098. Prioritise patching immediately. EPSS: 0.4%.

How to fix or mitigate EUVD-2025-21098?

Within 24 hours: Inventory all Tenda O3V2 devices in production and isolate them to a segregated network segment if possible; notify all stakeholders of the vulnerability. Within 7 days: Implement network access controls restricting httpd traffic on port 80/443 to authorized IPs only; disable the setNetworkService functionality if not business-critical; monitor for exploitation attempts. Within 30 days: Replace affected Tenda O3V2 devices with alternative equipment from vendors with active security support, or wait for official patch confirmation and immediately deploy when available.

O3 Firmware EUVD-2025-21098

| CVE-2025-7422 HIGH

Buffer Overflow (CWE-119)

2025-07-11 cna@vuldb.com

Buffer Overflow Tenda O3 Firmware

8.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation 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 8.8. EPSS 0.4%. Public PoC/exploit available. No patch confirmed.
Exploit ScenarioDerived	An attacker could exploit this vulnerability in A vulnerability classified as critical to compromise the security of affected deployments, potentially impacting confidentiality, integrity, or availability.

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 16, 2026

A buffer overflow vulnerability in A vulnerability classified as critical (CVSS 8.8). Risk factors: public PoC available.

Earlier versions of this analysis (1)

v1 Mar 16, 2026 - 08:17 CVSS 8.8

RemediationAI

Monitor vendor channels for patch availability. Consider network segmentation to limit exposure if patching is delayed.

Affected VersionsENISA

O3V2 1.0.0.12(3880)

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

CWE-119 (Buffer Overflow). CVSS 8.8 indicates high severity. Affects A vulnerability classified as critical.

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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

Jul 16, 2025 - 16:43 vuln.today

Public exploit code

CVE Published

Jul 11, 2025 - 01:15 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability classified as critical has been found in Tenda O3V2 1.0.0.12(3880). Affected is the function setAutoReboot of the file /goform/setNetworkService of the component httpd. The manipulation of the argument week leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Executive ViewAI

Why It Matters

A critical remote code execution vulnerability exists in Tenda O3V2 routers (version 1.0.0.12) that allows attackers to compromise devices without authentication. With public exploits available and no patch currently released, organizations using this equipment face immediate risk of network infiltration, data theft, and lateral movement into corporate infrastructure.

Business Impact: High

Compensating Controls

Implement WAF rules to block POST requests to /goform/setNetworkService endpoint; restrict administrative access to the httpd service via network segmentation (VLANs, firewall ACLs); disable the auto-reboot feature if operationally feasible; require VPN access for any management of these devices; deploy IDS/IPS signatures to detect exploitation attempts on the affected parameter; consider placing devices behind a reverse proxy with strict input validation.

Threat Intelligence Overview

EPSS Score

0.4%

Top 43% exploitable

Exploit

POC

Public exploit code exists

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

GitHub

VulDB

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.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.