CVE-2020-5204

HighCVSS 8.8/10Last modified Jun 17, 2026

Description

In uftpd before 2.11, there is a buffer overflow vulnerability in handle_PORT in ftpcmd.c that is caused by a buffer that is 16 bytes large being filled via sprintf() with user input based on the format specifier string %d.%d.%d.%d. The 16 byte size is correct for valid IPv4 addresses (len('255.255.255.255') == 16), but the format specifier %d allows more than 3 digits. This has been fixed in version 2.11

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-121CWE-120

Affected software

No affected versions have been published.

Timeline

Published
Jan 6, 2020
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2020-5204: High severity, CVSS 8.8 | Vulnix