CVE-2020-5204

Buffer overflow vulnerability in uftpd

HIGH
8.8
CVSS Score
Published: January 6, 2020 at 07:10 PM UTC
Updated: June 17, 2026 at 03:21 AM UTC
1 product affected across 1 vendorUftpd

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Severity
HIGH8.8
Exploit prediction
EPSS 1%

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2.11
Affected range stops below 2.11, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-121CWE-120

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