CVE-2019-25681

HIGH

Xlight FTP Server 3.9.1 SEH Overwrite Buffer Overflow

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2019-25681. PoCs published by Logan Whitmire.

AI-analyzed exploit summary This exploit demonstrates an SEH overwrite vulnerability in Xlight FTP Server 3.9.1 by generating a buffer overflow payload. The PoC creates a file with 428 'A' characters, which when pasted into the server configuration, triggers the crash and overwrites the SEH.

Description

Xlight FTP Server 3.9.1 contains a structured exception handler (SEH) overwrite vulnerability that allows local attackers to crash the application and overwrite SEH pointers by supplying a crafted buffer string. Attackers can inject a 428-byte payload through the program execution field in virtual server configuration to trigger a buffer overflow that corrupts the SEH chain and enables potential code execution.

Exploits (1)

exploitdb WORKING POC
by Logan Whitmire · pythondoswindows
https://www.exploit-db.com/exploits/46458

This exploit demonstrates an SEH overwrite vulnerability in Xlight FTP Server 3.9.1 by generating a buffer overflow payload. The PoC creates a file with 428 'A' characters, which when pasted into the server configuration, triggers the crash and overwrites the SEH.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Xlight FTP Server 3.9.1
Auth required
Prerequisites: Access to the Xlight FTP Server configuration interface · Ability to modify the 'Execute a program after user logged in' setting
devstral-2 · analyzed Apr 07, 2026 Full analysis →

References (4)

Core 4
Core References
Exploit exploit
ExploitDB-46458
https://www.exploit-db.com/exploits/46458
Product product
Official Product Homepage
https://www.xlightftpd.com/index.htm
Product product
Product Reference
https://www.xlightftpd.com/download/xlight.zip
Third Party Advisory third-party-advisory
VulnCheck Advisory: Xlight FTP Server 3.9.1 SEH Overwrite Buffer Overflow
https://www.vulncheck.com/advisories/xlight-ftp-server-seh-overwrite-buffer-overflow

Scores

CVSS v3 8.4
EPSS 0.0021
EPSS Percentile 11.0%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-787
Status published
Products (2)
Xlightftpd/Xlight 3.9.1
xlightftpd/xlight_ftp_server 3.9.1
Published Apr 05, 2026
Tracked Since Apr 06, 2026