ProFTPD before 1.3.9e and 1.3.10rc5 contains a buffer overflow vulnerability in the mod_rewrite int:utf8trans RewriteMap that allows remote attackers to overwrite static buffers. Attackers can send FTP command arguments longer than 1024 bytes, without authentication if pre-login commands are rewritten, to corrupt session memory and crash the session.
https://github.com/proftpd/proftpd/releases/tag/v1.3.9e
https://github.com/proftpd/proftpd/releases/tag/v1.3.10rc5
https://github.com/proftpd/proftpd/commit/502d280b8d0ef72e44c6dd0a35a9405af0a1e301
https://github.com/proftpd/proftpd/blob/v1.3.9d/contrib/mod_rewrite.c#L2052
https://github.com/proftpd/proftpd
Published: 2026-10-30
Updated: 2026-10-30
Base Score: 5.1
Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P
Severity: Medium
Base Score: 5.6
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Severity: Medium
Base Score: 6.3
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Severity: Medium
EPSS: 0.00459