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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.
Use CWE-189, Proftpd vendor hub and Proftpd product page to widen CVE-2011-1137 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2019-12815, CVE-2010-20103 and CVE-2020-9273 for nearby disclosures in the same product family.