What is the CVSS score of CVE-2020-36941?

CVE-2020-36941 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2020-36941?

Yes, a public proof-of-concept exploit is available for CVE-2020-36941. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2020-36941?

Within 24 hours: Immediately disable Knockpy 4.1.1 or restrict access to trusted internal networks only; audit recent CSV exports for suspicious formulas and notify affected teams. Within 7 days: Implement input validation and output encoding controls at the application layer; conduct forensic analysis of Knockpy logs for signs of exploitation. Within 30 days: Evaluate alternative DNS reconnaissance tools with active security maintenance; establish a process to identify and remediate unsupported software dependencies across the infrastructure.

Knockpy CVE-2020-36941

CRITICAL

Improper Neutralization of Formula Elements in a CSV File (CWE-1236)

2026-01-27 disclosure@vulncheck.com

Code Injection Knockpy

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-1236 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V1 - Encoding and Sanitization CSV injection prevention
Impact	CVSS 9.8 with PoC.
Exploit ScenarioDerived	Crafted subdomain names inject formulas into CSV exports.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Knockpy 4.1.1 has CSV injection in subdomain scan exports.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

CSV injection in Knockpy scan results.

RemediationAI

Update Knockpy. Sanitize CSV exports.

Affects your stack

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Technical ContextAI · show details

CWE-1236.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/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

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Mar 24, 2026 - 21:24 vuln.today

Public exploit code

CVE Published

Jan 27, 2026 - 16:16 nvd

CRITICAL 9.8

DescriptionCVE.org

Knockpy 4.1.1 contains a CSV injection vulnerability that allows attackers to inject malicious formulas into CSV reports through unfiltered server headers. Attackers can manipulate server response headers to include spreadsheet formulas that will execute when the CSV is opened in spreadsheet applications.

Executive ViewAI

Why It Matters

CVE-2020-36941 is a critical CSV injection vulnerability in Knockpy 4.1.1 that allows attackers to embed malicious formulas into exported reports, potentially leading to data theft, system compromise, or lateral movement within the organization. Any user or system utilizing Knockpy for DNS reconnaissance and report generation is at immediate risk of exploitation.

Business Impact: Severe

Compensating Controls

Implement Web Application Firewall (WAF) rules to filter malicious formula patterns (=, +, -, @, etc.) in HTTP headers before they reach Knockpy; disable CSV export functionality if not operationally critical; restrict Knockpy execution to isolated, non-privileged accounts with minimal network access; enforce file download policies that block execution of downloaded CSV files; monitor and log all Knockpy activities for anomalous header injection attempts.

Threat Intelligence Overview

EPSS Score

0.1%

Top 80% exploitable

Exploit

POC

Public exploit code exists

Data Quality

6 sources

Confidence: High

NVD

CVE.org

EPSS

Exploit-DB

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 CRITICAL

CISA KEV No

Public POC Yes

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

CRITICAL severity + public POC available

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

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.