What is the CVSS score of CVE-2020-36964?

CVE-2020-36964 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%.

Which versions of YATinyWinFTP are affected by CVE-2020-36964?

YATinyWinFTP contains a critical vulnerability (CVE-2020-36964) that allows remote attackers to crash the FTP service with a single malformed command, causing immediate service unavailability.

Is there a public PoC exploit available for CVE-2020-36964?

Yes, a public proof-of-concept exploit is available for CVE-2020-36964. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2020-36964?

Within 24 hours: Identify all systems running YATinyWinFTP and isolate them from untrusted networks; implement network-level access controls to restrict FTP connections to authorized users only. Within 7 days: Evaluate migration to a maintained FTP alternative (e.g., OpenSSH SFTP, ProFTPD, or commercial solutions) and begin testing in non-production environments. Within 30 days: Complete migration to patched/supported FTP software or decommission YATinyWinFTP if business requirements permit; validate all file transfer workflows function properly on replacement platform.

YATinyWinFTP CVE-2020-36964

CRITICAL

Out-of-bounds Write (CWE-787)

2026-01-28 disclosure@vulncheck.com

Buffer Overflow Denial Of Service

9.8

CVSS 3.1 · NVD

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 29, 2026 - 19:16 vuln.today

Public exploit code

CVE Published

Jan 28, 2026 - 18:16 nvd

CRITICAL 9.8

DescriptionCVE.org

YATinyWinFTP contains a denial of service vulnerability that allows attackers to crash the FTP service by sending a 272-byte buffer with a trailing space. Attackers can exploit the service by connecting and sending a malformed command that triggers a buffer overflow and service crash.

AnalysisAI

YATinyWinFTP has a denial of service vulnerability allowing remote attackers to crash the FTP service by sending a 272-byte crafted packet.

Technical ContextAI

YATinyWinFTP has a CWE-787 out-of-bounds write vulnerability triggered by a specific 272-byte network packet, causing the FTP server to crash immediately.

Affected ProductsAI

YATinyWinFTP

RemediationAI

Replace with a more robust FTP server. YATinyWinFTP is not suitable for production use.

CVE-2020-36964 vulnerability details – vuln.today

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YATinyWinFTP CVE-2020-36964

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

Affected ProductsAI

RemediationAI

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External POC / Exploit Code