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Vulnerability record · CVE-2020-5204 · published 6 January 2020

CVE-2020-5204: Troglobit uftpd stack-based buffer overflow vulnerability

Troglobit · Uftpd

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

8.8 CVSS 3.1 High EPSS 1.1% · top 36.3% CWE-121 · Stack-based buffer overflowCWE-120 · Classic buffer overflow
8.8CVSS 3.1 base score, v2 6.5
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00034.html
https://github.com/troglobit/uftpd/commit/0fb2c031ce0ace07cc19cd2cb2143c4b5a63c9dd PatchThird Party Advisory
https://github.com/troglobit/uftpd/security/advisories/GHSA-wrpr-xw7q-9wvq Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00034.html
https://github.com/troglobit/uftpd/commit/0fb2c031ce0ace07cc19cd2cb2143c4b5a63c9dd PatchThird Party Advisory
https://github.com/troglobit/uftpd/security/advisories/GHSA-wrpr-xw7q-9wvq Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-5204), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.