Code execution via oversized SYST response
Published Feb 18, 2026 · Updated Feb 18, 2026
Stack-based buffer overflow in Sergey Ayukov NFTP 1.71 allows remote attackers to execute arbitrary code via a malicious FTP server. The SYST response handler copies an oversized server reply into a stack buffer without enforcing its capacity, allowing control-flow overwrite. The victim must use the client to connect to an attacker-controlled FTP server; the published Windows XP exploit overwrites EIP and opens a bind shell on port 5150.
Summary
What happened
Stack-based buffer overflow in Sergey Ayukov NFTP 1.71 allows remote attackers to execute arbitrary code via a malicious FTP server. The SYST response handler copies an oversized server reply into a stack buffer without enforcing its capacity, allowing control-flow overwrite. The victim must use the client to connect to an attacker-controlled FTP server; the published Windows XP exploit overwrites EIP and opens a bind shell on port 5150.
The record
- CVE
- CVE-2019-25361
- Published
- Feb 18, 2026
- Updated
- Feb 18, 2026
- Vendor
- Sergey Ayukov
- Product
- NFTP
- Classifications
- CWE-121, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 18, 2026CVE publishedPublication date reported by the CVE source.
- Feb 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.71
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Ayukov NFTP client 1.71 - SYST Buffer Overflowweaponized · demonstrated
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Technologies
Your stack
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Your stack
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