What is the CVSS score of CVE-2020-37197?

CVE-2020-37197 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-2020-37197?

Yes, a public proof-of-concept exploit is available for CVE-2020-37197. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2020-37197?

Within 24 hours: Inventory all systems running Dnss software and assess criticality to business operations. Within 7 days: Implement input validation controls, disable public access to the registration name field if possible, and establish monitoring for crash events. Within 30 days: Evaluate alternative DNS solutions or vendor roadmap for patches; consider isolating affected systems to internal networks only until remediation is available.

Domain Name Search Software CVE-2020-37197

MEDIUM

Classic Buffer Overflow (CWE-120)

2026-02-11 disclosure@vulncheck.com

Buffer Overflow Denial Of Service Domain Name Search Software Nsasoft

4.6

CVSS 4.0 · Vendor: vulncheck

View

Vulnerability Assessment

Weakness	CWE CWE-120 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list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 overflowing the 'Name' input field.

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

Dnss Domain Name Search Software contains a denial of service vulnerability that allows attackers to crash the application by overflowing the 'Name' input field. Attackers can generate a 1000-character buffer payload and paste it into the registration name 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-120 (Classic Buffer Overflow). Affects Domain Name Search Software. Dnss Domain Name Search Software contains a denial of service vulnerability that allows attackers to crash the application by overflowing the 'Name' input field. Attackers can generate a 1000-character buffer payload and paste it into the registration name 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 26, 2026 - 23:21 vuln.today

Public exploit code

CVE Published

Feb 11, 2026 - 21:16 nvd

HIGH 7.5

DescriptionCVE.org

Executive ViewAI

Why It Matters

A denial-of-service vulnerability in Dnss Domain Name Search Software allows attackers to crash the application by submitting oversized input, potentially disrupting DNS query operations and service availability. Organizations using this software face operational disruption risks, particularly if the application is business-critical or customer-facing.

Business Impact: High

Compensating Controls

Implement Web Application Firewall (WAF) rules to reject requests with Name field payloads exceeding 256 characters; restrict registration functionality to trusted internal users only; disable or remove the registration name feature if not essential; implement network segmentation to limit exposure; enable application logging and alerting to detect crash events; consider running the application in a containerized environment with automatic restart capabilities to minimize downtime.

Threat Intelligence Overview

EPSS Score

0.0%

Top 92% 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

High

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.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.