What is the CVSS score of CVE-2025-5503?

CVE-2025-5503 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: 0.7%.

Is there a public PoC exploit available for CVE-2025-5503?

Yes, a public proof-of-concept exploit is available for CVE-2025-5503. Prioritise patching immediately. EPSS: 0.7%.

How to fix or mitigate CVE-2025-5503?

Within 24 hours: Identify and inventory all TOTOLIK X15 devices (version 1.0.0-B20230714.1105) in your network; isolate affected devices from production networks if possible and restrict administrative access. Within 7 days: Implement network segmentation to limit device access, block inbound connections to port ranges used by vulnerable services, and deploy WAF/IDS rules to detect exploitation attempts targeting /boafrm/formMapReboot. Within 30 days: Replace affected devices with alternative vendor equipment or identify and test vendor firmware updates if released; document all affected assets and conduct network access audit.

X15 Firmware CVE-2025-5503

EUVD-2025-16742 HIGH

Buffer Overflow (CWE-119)

2025-06-03 cna@vuldb.com

Buffer Overflow X15 Firmware TOTOLINK

8.8

CVSS 3.1 · NVD

View

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Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution,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 0.7%. Public PoC/exploit available. No patch confirmed.
Exploit ScenarioDerived	An attacker could exploit this vulnerability in the affected application 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 0.7% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 14, 2026

A buffer overflow vulnerability (CVSS 8.8). Risk factors: public PoC available.

Earlier versions of this analysis (1)

v1 Mar 14, 2026 - 17:04 CVSS 8.8

RemediationAI

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

Affected VersionsENISA

X15 1.0.0-B20230714.1105

Affected Packages

euvd x15 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

CWE-119 (Buffer Overflow). CVSS 8.8 indicates high severity.

Know when X15 Firmware gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

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 - 20:40 vuln.today

Public exploit code

CVE Published

Jun 03, 2025 - 15:16 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability, which was classified as critical, was found in TOTOLINK X15 1.0.0-B20230714.1105. This affects the function formMapReboot of the file /boafrm/formMapReboot. The manipulation of the argument deviceMacAddr leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Executive ViewAI

Why It Matters

TOTOLINK X15 routers are vulnerable to remote code execution through a stack-based buffer overflow with a public exploit actively available. Any organization using this device model is at immediate risk of unauthorized access, data exfiltration, and network compromise, with no vendor patch currently available.

Business Impact: Severe

Compensating Controls

Implement network segmentation to restrict access to TOTOLINK devices; deploy intrusion detection/prevention rules to monitor and block requests to /boafrm/formMapReboot endpoint; disable remote management features if operationally feasible; place devices behind firewall rules limiting exposure; monitor for suspicious deviceMacAddr parameter values in HTTP traffic; consider WAF filtering for malformed input to the vulnerable endpoint. Monitor vendor advisories for emergency firmware patches.

Threat Intelligence Overview

EPSS Score

0.7%

Top 29% 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 0.7%

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

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

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.