How to fix CVE-2025-7422?

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.

Is O3 Firmware affected by CVE-2025-7422?

A critical remote code execution vulnerability exists in Tenda O3V2 routers (version 1.0.0.12) that allows attackers to compromise devices without authentication.

CVE-2025-7422

EUVD-2025-21098 HIGH

2025-07-11 [email protected]

8.8

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 16, 2026 - 08:17 vuln.today

EUVD ID Assigned

Mar 16, 2026 - 08:17 euvd

EUVD-2025-21098

PoC Detected

Jul 16, 2025 - 16:43 vuln.today

Public exploit code

CVE Published

Jul 11, 2025 - 01:15 nvd

HIGH 8.8

Description

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.

Analysis

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

Technical Context

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

Affected Products

['A vulnerability classified as critical']

Remediation

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

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.4

CVSS: +44

POC: +20

CVE-2025-7422 vulnerability details – vuln.today

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CVE-2025-7422

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CVE-2025-7422

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

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External POC / Exploit Code