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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| troglobit | uftpd | < 2.11 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | uftpd | 2.11-lp151.2.3.1 | openSUSE-SU-2020:0069-1 |
Advisories 1
- openSUSE-SU-2020:0069-1 Security update for uftpd SUSE / openSUSE Security Updates · Feb 4, 2026