CVE-2021-40524
Fixed in a distro release EPSS 4%
In Pure-FTPd before 1.0.50, an incorrect max_filesize quota mechanism in the server allows attackers to upload files of unbounded size, which may lead to denial of service or a server hang. This occurs because a certain greater-than-zero test does not anticipate an initial -1 value. (Versions 1.0.23 through 1.0.49 are affected.)
Products: pureftpd pure-ftpd
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 11 | pure-ftpd | 1.0.49-4.1+deb11u1 |
| Debian 12 | pure-ftpd | 1.0.50-1 |
| Debian 13 | pure-ftpd | 1.0.50-1 |
| Ubuntu 16.04 LTS | pure-ftpd | no fix |
| Ubuntu 18.04 LTS | pure-ftpd | no fix |
| Ubuntu 20.04 LTS | pure-ftpd | no fix |
| Ubuntu 22.04 LTS | pure-ftpd | no fix |
| Ubuntu 24.04 LTS | pure-ftpd | no fix |
| Ubuntu 25.10 | pure-ftpd | no fix |
| Ubuntu 26.04 LTS | pure-ftpd | no fix |
| openSUSE Tumbleweed | pure-ftpd | 1.0.50-1.1 |