What is the CVSS score of CVE-2025-14139?

CVE-2025-14139 has a CVSS 4.0 base score of 5.5 (Medium). CVSS vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2025-14139?

Yes, a public proof-of-concept exploit is available for CVE-2025-14139. Prioritise patching immediately. EPSS: 0.1%.

520w Firmware CVE-2025-14139

EUVD-2025-201550 MEDIUM

Buffer Overflow (CWE-119)

2025-12-06 cna@vuldb.com

Buffer Overflow 520w Firmware Utt

5.5

CVSS 4.0 · Vendor: vuldb

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A06:2021 - Vulnerable and Outdated Components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.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv2 – Jul 26, 2026

Buffer overflow in the DNS filter configuration interface of UTT 520W firmware 1.7.7-180627 allows adjacent network attackers with low privileges to cause denial of service by submitting an overly long timeRangeName parameter. Public proof-of-concept code is available, but exploitation requires authenticated access from the local network. The vendor did not respond to disclosure and no patch is available.

Earlier versions of this analysis (1)

v1 Mar 15, 2026 - 17:37 CVSS 5.7

Affected VersionsENISA

进取 520W 1.7.7-180627

Affected Packages

euvd 进取_520w 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.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (vuldb) PRIMARY 5.5 MEDIUM

CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

Primary rating from Vendor (vuldb) · only source for this CVE.

CVSS VectorVendor: vuldb

Attack Vector

Adjacent

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

None

Vulnerable system: Integrity

None

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

CVSS changed

Apr 29, 2026 - 01:11 NVD

5.7 (MEDIUM) 5.5 (MEDIUM)

PoC Detected

Dec 12, 2025 - 12:43 vuln.today

Public exploit code

CVE Published

Dec 06, 2025 - 15:15 nvd

MEDIUM 5.7

CVE Published

Dec 06, 2025 - 15:15 cve.org

MEDIUM 5.5

DescriptionCVE.org

A security vulnerability has been detected in UTT 进取 520W 1.7.7-180627. Impacted is the function strcpy of the file /goform/formConfigDnsFilterGlobal. Such manipulation of the argument timeRangeName leads to buffer overflow. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Executive ViewAI

Why It Matters

Organizations using A security vulnerability should be aware of moderate risk from CVE-2025-14139, a buffer overflow vulnerability rated CVSS 5.7. Exploitation could cause memory corruption or application crashes. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.

Recommended Action

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Business Impact: Low

Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score

0.1%

Top 74% 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 MEDIUM

CISA KEV No

Public POC Yes

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Defer

Exploitation· derived

Poc

System Exposure· derived

Controlled

Automatable· derived

Human Impact

Low

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +28

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.