CVE-2011-1137
MEDIUMEPSS 98th pctlDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v2 Vector
No CVSS vector data available.
Exploit Intelligence
Very high risk: more likely to be exploited than 98% of all known CVEs.
References
Related Vulnerabilities
Other CWE-189 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2015-1538 | High | 10.0 | 99% | - | - |
| CVE-2006-3747 | High | 7.6 | 96% | - | Fix |
| CVE-2007-0071 | High | 9.3 | 93% | - | - |
| CVE-2015-3829 | High | 10.0 | 90% | - | - |
| CVE-2015-3864 | High | 10.0 | 87% | - | - |
| CVE-2015-1539 | High | 10.0 | 86% | - | - |
Common questions
How do I fix CVE-2011-1137?
Upgrade proftpd-dfsg on debian 11 to 1.3.3d-4 or later.
Is CVE-2011-1137 being actively exploited?
Not that we know of. CVE-2011-1137 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 28.1% is the estimated probability that it will be exploited in the next 30 days. That is higher than 98% of all scored CVEs.
How severe is CVE-2011-1137?
CVE-2011-1137 has a CVSS v2 base score of 5.0, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2011-1137 affect?
Published advisories record a fix for proftpd-dfsg (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.