What is the CVSS score of CVE-2019-25361?

CVE-2019-25361 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: 0.2%.

Is there a public PoC exploit available for CVE-2019-25361?

Yes, a public proof-of-concept exploit is available for CVE-2019-25361. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2019-25361?

Within 24 hours: Identify and inventory all systems running Ayukov NFTP client 1.71; immediately disable NFTP services or restrict network access to trusted hosts only. Within 7 days: Upgrade to the latest patched version of Ayukov NFTP client if available, or migrate to an alternative FTP solution; conduct network monitoring for exploitation attempts. Within 30 days: Complete deployment of patches across all affected systems; perform forensic analysis on vulnerable systems to detect prior compromise; review access logs and network traffic for indicators of exploitation.

DNS CVE-2019-25361

CRITICAL

Stack-based Buffer Overflow (CWE-121)

2026-02-18 disclosure@vulncheck.com

Buffer Overflow DNS

9.8

CVSS 3.1 · NVD

View

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Weakness	CWE CWE-121 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Stack buffer bounds checking MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list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 9.8, EPSS 0.23%. Client-side vulnerability — connecting to a malicious FTP server triggers the overflow.
Exploit ScenarioDerived	Attacker sets up rogue FTP server, victim connects with NFTP, server sends oversized SYST response that overflows the buffer and executes attacker code.

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

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Buffer overflow in Ayukov NFTP client 1.71 in SYST command handling allows remote FTP servers to execute arbitrary code on connecting clients. PoC available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

Stack overflow in NFTP client via malicious FTP server response.

RemediationAI

Update NFTP client. Validate server response lengths.

Affected ProductsAI

Ayukov NFTP 1.71

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

CWE-121 stack overflow triggered by oversized SYST command response from a malicious FTP server.

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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

Feb 19, 2026 - 15:53 vuln.today

Public exploit code

CVE Published

Feb 18, 2026 - 22:16 nvd

CRITICAL 9.8

DescriptionCVE.org

Ayukov NFTP client 1.71 contains a buffer overflow vulnerability in the SYST command handling that allows remote attackers to execute arbitrary code. Attackers can send a specially crafted SYST command with oversized payload to trigger a buffer overflow and execute a bind shell on port 5150.

Executive ViewAI

Why It Matters

Ayukov NFTP client 1.71 contains a critical remote code execution vulnerability (CVSS 9.8) that allows unauthenticated attackers to gain complete system control without user interaction. Any organization running this vulnerable client is at immediate risk of data theft, system compromise, and lateral network movement, with public exploits already available.

Business Impact: Severe

Compensating Controls

Until patching is available: (1) Immediately disable NFTP client or restrict its network access via firewall rules to only authorized internal systems; (2) Implement network segmentation to isolate systems running NFTP client; (3) Deploy WAF/IDS rules to block SYST commands with oversized payloads; (4) Monitor for unauthorized bind shell connections on port 5150 and related high-numbered ports; (5) Disable NFTP client feature if business operations allow; (6) Implement host-based intrusion detection on vulnerable systems.

Threat Intelligence Overview

EPSS Score

0.2%

Top 54% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

Exploit-DB

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 0.2%

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

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.