CVE-2011-1137Proftpd Vulnerability
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.
Published Mar 11, 2011 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2011-1137, DSA-2185-1
Key Facts
Routine patching- CVE-2011-1137 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Proftpd, proftpd-dfsg (debian), proftpd-devel (suse) and 7 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 28% probability of exploitation in the next 30 days.
- Fixed versions are available, including Proftpd 1.3.5b-2.5, Proftpd 1.3.3, proftpd-devel 1.3.5b-2.5.
- Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
Scores
CVSS v2
5.0
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS (30-day exploit likelihood)
28%
Higher than 98.0% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
40/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2011-1137
- advisoryhttp://proftp.cvs.sourceforge.net/viewvc/proftp/proftpd/contrib/mod_sftp/packet.c?r1=1.14.2.2&r2=1.14.2.3
- advisoryhttp://proftp.cvs.sourceforge.net/viewvc/proftp/proftpd/contrib/mod_sftp/packet.h?r1=1.3&r2=1.3.2.1
- advisory43234
- advisory43635
- advisoryADV-2011-0617
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.
Affected Products
85 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ProftpdProftpd | 1.2.0, 1.2.0-pre10, 1.2.0-pre9, 1.2.0-rc1, 1.2.0-rc2, 1.2.0-rc3, 1.2.1, 1.2.10 | 1.3.3 |
| proftpd-dfsgdebian | See advisory | 1.3.3d-4 |
| proftpd-develsuse | See advisory | 1.3.5b-2.5 |
| proftpd-docsuse | See advisory | 1.3.5b-2.5 |
| proftpd-langsuse | See advisory | 1.3.5b-2.5 |
Patched Releases
Proftpd
1.3.5b-2.5, 1.3.3
proftpd-devel
1.3.5b-2.5
proftpd-dfsg
1.3.3a-6squeeze1, 1.3.3d-4
proftpd-doc
1.3.5b-2.5
proftpd-lang
1.3.5b-2.5
proftpd-ldap
1.3.5b-2.5
proftpd-mysql
1.3.5b-2.5
proftpd-pgsql
1.3.5b-2.5
proftpd-radius
1.3.5b-2.5
proftpd-sqlite
1.3.5b-2.5
Timeline
Publicly disclosed
Mar 11, 2011
Last updated
Aug 4, 2026
Weakness Type
- CWE-189
References
- advisorysecurity-tracker.debian.org · CVE-2011-1137
- advisoryproftp.cvs.sourceforge.net · packet.c
- advisoryproftp.cvs.sourceforge.net · packet.h
- advisory43234
- advisory43635
FAQ
Common Questions.
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.
Affected: Proftpd versions 1.2.0, 1.2.0-pre10, 1.2.0-pre9, 1.2.0-rc1, 1.2.0-rc2, 1.2.0-rc3, 1.2.1, 1.2.10; proftpd-dfsg (debian); proftpd-devel (suse), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Proftpd 1.3.5b-2.5, Proftpd 1.3.3, proftpd-devel 1.3.5b-2.5.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
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