What is the CVSS score of CVE-2020-37200?

CVE-2020-37200 has a CVSS 4.0 base score of 4.6 (Medium). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2020-37200?

Yes, a public proof-of-concept exploit is available for CVE-2020-37200. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2020-37200?

Within 24 hours: Inventory all systems running NetShareWatcher 1.5.8.0 and assess usage criticality. Within 7 days: Implement input validation controls and user awareness training to prevent accidental or malicious payload entry; isolate affected systems from untrusted networks if possible. Within 30 days: Contact vendor for patch availability timeline; evaluate alternative file-monitoring solutions if patch is not released; plan upgrade or replacement strategy.

Netsharewatcher CVE-2020-37200

MEDIUM

Stack-based Buffer Overflow (CWE-121)

2026-02-11 disclosure@vulncheck.com

Buffer Overflow Stack Overflow Netsharewatcher Nsasoft

4.6

CVSS 4.0 · Vendor: vulncheck

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Vulnerability Assessment

Weakness	CWE CWE-121 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Stack buffer bounds checking MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list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 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Public exploit/POC available.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to crash the application by supplying oversized input.

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

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

NetShareWatcher 1.5.8.0 contains a buffer overflow vulnerability in the registration key input that allows attackers to crash the application by supplying oversized input. Attackers can generate a 1000-character payload and paste it into the registration key field to trigger an application crash. [CVSS 7.5 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

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

Classified as CWE-121 (Stack-based Buffer Overflow). Affects Netsharewatcher. NetShareWatcher 1.5.8.0 contains a buffer overflow vulnerability in the registration key input that allows attackers to crash the application by supplying oversized input. Attackers can generate a 1000-character payload and paste it into the registration key field to trigger an application crash.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (vulncheck) PRIMARY 4.6 MEDIUM

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

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

CVSS VectorVendor: vulncheck

Attack Vector

Local

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

Active

Vulnerable system: Confidentiality

None

Vulnerable system: Integrity

None

Vulnerable system: Availability

Low

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

Severity Changed

Jun 29, 2026 - 18:37 NVD

HIGH MEDIUM

CVSS changed

Jun 29, 2026 - 18:37 NVD

7.5 (HIGH) 4.6 (MEDIUM)

PoC Detected

Feb 17, 2026 - 20:37 vuln.today

Public exploit code

CVE Published

Feb 11, 2026 - 21:16 nvd

HIGH 7.5

DescriptionCVE.org

Executive ViewAI

Why It Matters

NetShareWatcher 1.5.8.0 is vulnerable to a denial-of-service attack that crashes the application when users enter oversized input into the registration key field. Organizations using this software risk service interruption and potential operational downtime, particularly if the application is critical to file-sharing monitoring or compliance workflows.

Business Impact: Medium

Compensating Controls

Restrict application access to trusted users only; implement network segmentation to limit who can interact with NetShareWatcher; disable remote access to the application if not operationally required; monitor application logs for crash events as an early warning indicator; consider Web Application Firewall (WAF) rules to block requests with oversized registration key parameters if the application is exposed via web interface; plan for rapid service restart procedures to minimize downtime from crashes.

Threat Intelligence Overview

EPSS Score

0.0%

Top 90% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

Exploit-DB

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 0.0%

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

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Small

Automatable· derived

Human Impact

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +23

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.

Stack-based Buffer Overflow HIGH

A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.