Description
Integer overflow in the mod_sftp (aka SFTP) module in ProFTPD 1.3.3d and earlier allows remote attackers to cause a denial of service (memory consumption leading to OOM kill) via a malformed SSH message.
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | proftpd-dfsg | 1.3.3d-4 | — |
| Debian 13 | proftpd-dfsg | 1.3.3d-4 | — |
| Debian 12 | proftpd-dfsg | 1.3.3d-4 | — |
| Debian 6.0 | proftpd-dfsg | 1.3.3a-6squeeze1 | DSA-2185-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | proftpd | 1.3.5b-2.5 | openSUSE-SU-2024:10048-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- ProFTPd - 'mod_sftp' Integer Overflow Denial of Service (PoC) EDB-16129 · dos · Feb 7, 2011
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- DSA-2185-1 proftpd-dfsg - integer overflow Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10048-1 proftpd-1.3.5b-2.5 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- SSA:2011-095-01 vendor-advisory
- http://proftp.cvs.sourceforge.net/viewvc/proftp/proftpd/contrib/mod_sftp/packet.h?r1=1.3&r2=1.3.2.1
- 16129 exploit
- 43978 third-party-advisory
- ADV-2011-0857 vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=681718
- 46183 vdb-entry
- DSA-2185 vendor-advisory
- http://bugs.proftpd.org/show_bug.cgi?id=3586
- http://bugs.proftpd.org/show_bug.cgi?id=3587
- http://proftp.cvs.sourceforge.net/viewvc/proftp/proftpd/contrib/mod_sftp/packet.c?r1=1.14.2.2&r2=1.14.2.3
- ADV-2011-0617 vdb-entry
- http://proftp.cvs.sourceforge.net/viewvc/proftp/proftpd/contrib/mod_sftp/mod_sftp.c?r1=1.29.2.1&r2=1.29.2.2
- FEDORA-2011-5040 vendor-advisory
- 43234 third-party-advisory
- FEDORA-2011-5033 vendor-advisory
- 43635 third-party-advisory