Allocation of Resources Without Limits or Throttling in basic-ftp - #VU128255
Published: April 28, 2026
Vulnerability identifier: #VU128255
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: patrickjuchli
Affected software:
basic-ftp
basic-ftp
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in FtpContext._partialResponse and FTP control response parsing when processing unterminated multiline control-channel responses during the initial FTP banner phase. A remote attacker can send a specially crafted FTP server banner to cause a denial of service.
The issue is triggered before authentication, and no additional user interaction is required after the application initiates a normal FTP connection.
Remediation
Install security update from vendor's website.