What is the CVSS score of CVE-2025-6113?

CVE-2025-6113 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: 0.2%.

Is there a public PoC exploit available for CVE-2025-6113?

Yes, a public proof-of-concept exploit is available for CVE-2025-6113. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2025-6113?

Within 24 hours: Inventory all Tenda FH1203 devices in production and isolate affected units from critical network segments if possible. Within 7 days: Implement network-level mitigations (WAF rules blocking /goform/AdvSetLanip requests, network segmentation restricting router admin access). Within 30 days: Replace affected Tenda FH1203 units with patched firmware versions or alternative vendors; evaluate firmware upgrade options from Tenda if available or discontinue use of vulnerable hardware.

Fh1203 Firmware CVE-2025-6113

EUVD-2025-18378 HIGH

Buffer Overflow (CWE-119)

2025-06-16 cna@vuldb.com

Buffer Overflow Tenda Fh1203 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Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution,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	This vulnerability presents CRITICAL real-world risk despite requiring authentication (PR:L). Attack Vector Network (AV:N) and Low Complexity (AC:L) indicate no special conditions needed to trigger exploitation. The CVSS 3.1 score of 8.8 appropriately reflects high severity. The public POC disclosure significantly elevates real-world risk—defenders cannot rely on obscurity. While the PR:L requirement (authenticated attacker) is a mitigating factor, Tenda routers are frequently deployed with default credentials or weak authentication, reducing practical barrier to entry. EPSS score (if available) would likely indicate high exploitation probability given public POC and network-accessible target. This is NOT a theoretical high-CVSS-low-risk issue; rather, it represents an active threat to deployed Tenda FH1203 devices. Organizations should prioritize patching based on exposure to these routers in their infrastructure.
Exploit ScenarioDerived	An attacker with valid credentials (obtained through default credentials, credential reuse, or phishing) accesses the Tenda FH1203 web interface remotely via HTTP/HTTPS on port 80/443. The attacker crafts a POST request to /goform/AdvSetLanip with an oversized lanMask parameter containing a buffer overflow payload (shellcode or ROP chain). The vulnerable fromadvsetlanip function copies this input without bounds checking into a stack buffer, corrupting the return address. Upon function return, execution jumps to attacker-controlled code, granting arbitrary command execution with root privileges on the router. The attacker can then pivot to compromise internal networks, establish persistence, exfiltrate traffic, or use the router as a botnet node. The public POC eliminates need for custom exploit development, making this accessible to low-skilled attackers.

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

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 14, 2026

Critical remote buffer overflow vulnerability in Tenda FH1203 firmware version 2.0.1.6 affecting the /goform/AdvSetLanip endpoint. An authenticated attacker can exploit improper input validation of the lanMask parameter to achieve remote code execution with full system compromise (confidentiality, integrity, and availability). A public proof-of-concept exploit exists, indicating active disclosure and potential real-world exploitation risk.

RemediationAI

Immediate actions: (1) Check for available firmware updates from Tenda's official support website or admin interface (Settings > System Tools > Firmware Upgrade). (2) If patched firmware is available for FH1203, upgrade immediately. (3) Temporary workarounds while awaiting patch: disable remote management access, restrict web interface access to trusted networks only via firewall rules, change default credentials to strong unique passwords, monitor router logs for suspicious /goform/AdvSetLanip requests. (4) Consider network segmentation to isolate router management traffic. (5) Monitor Tenda's security advisories at tenda.com.cn or regional support sites for patch availability. Without access to specific vendor advisory links in provided references, recommend checking Tenda support directly and security databases (NVD, Exploit-DB) for patch version information once released.

Affected VersionsENISA

FH1203 2.0.1.6

Affected Packages

euvd fh1203 no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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

Technical ContextAI · show details

The vulnerability exists in the fromadvsetlanip function within the Tenda FH1203 router's web administration interface. Tenda FH1203 is a residential WLAN router running proprietary firmware. The vulnerability is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a classic stack-based buffer overflow caused by insufficient bounds checking on the lanMask parameter. The affected endpoint /goform/AdvSetLanip handles LAN IP configuration requests and fails to validate the length of user-supplied input before copying it into a fixed-size buffer. This allows an authenticated attacker to overwrite adjacent stack memory, potentially hijacking control flow to execute arbitrary code with router privileges. CPE identifier: cpe:2.3:o:tenda:fh1203_firmware:2.0.1.6:*:*:*:*:*:*:*

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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

Jun 17, 2025 - 19:38 vuln.today

Public exploit code

CVE Published

Jun 16, 2025 - 08:15 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability, which was classified as critical, was found in Tenda FH1203 2.0.1.6. Affected is the function fromadvsetlanip of the file /goform/AdvSetLanip. The manipulation of the argument lanMask leads to 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 FH1203 wireless routers (version 2.0.1.6) affecting the LAN configuration function. Organizations using this equipment face immediate risk of unauthorized network access and potential lateral movement into internal systems, with active exploits already public and weaponized.

Business Impact: High

Compensating Controls

Restrict network access to router administration interfaces (block external WAN access to /goform/AdvSetLanip endpoint); implement Web Application Firewall (WAF) rules to filter malicious lanMask parameter values; apply strict input validation at network boundary; segment router management traffic onto isolated administrative VLAN; disable remote management features if not required; monitor for exploitation attempts; consider hardware replacement pending firmware availability from vendor.

Threat Intelligence Overview

EPSS Score

0.2%

Top 58% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

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 0.2%

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.