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Vulnerability record · CVE-2004-1602 · published 15 October 2004

CVE-2004-1602: Proftpd observable discrepancy vulnerability

PProftpd · Proftpd

ProFTPD 1.2.x, including 1.2.8 and 1.2.10, responds in a different amount of time when a given username exists, which allows remote attackers to identify valid usernames by timing the server response.

5.0 CVSS 2.0 Medium EPSS 31% · top 1.8% CWE-203 · Observable discrepancy
5.0CVSS 2.0 base score
31%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 6 tagged exploit
16 Jun 2026Last modified by NVD

Description

ProFTPD 1.2.x, including 1.2.8 and 1.2.10, responds in a different amount of time when a given username exists, which allows remote attackers to identify valid usernames by timing the server response.

AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://marc.info/?l=bugtraq&m=109786760926133&w=2 Third Party Advisory
http://security.lss.hr/index.php?page=details&ID=LSS-2004-10-02 Broken LinkExploitPatchVendor Advisory
http://securitytracker.com/id?1011687 Broken LinkExploitPatchThird Party AdvisoryVDB EntryVendor Advisory
http://www.securityfocus.com/bid/11430 Broken LinkExploitThird Party AdvisoryVDB EntryVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/17724 Third Party AdvisoryVDB Entry
http://marc.info/?l=bugtraq&m=109786760926133&w=2 Third Party Advisory
http://security.lss.hr/index.php?page=details&ID=LSS-2004-10-02 Broken LinkExploitPatchVendor Advisory
http://securitytracker.com/id?1011687 Broken LinkExploitPatchThird Party AdvisoryVDB EntryVendor Advisory
http://www.securityfocus.com/bid/11430 Broken LinkExploitThird Party AdvisoryVDB EntryVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/17724 Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2015-3306ProFTPD mod_copy arbitrary file read and writeThe mod_copy module in ProFTPD 1.3.5 fails to restrict the SITE CPFR and SITE CPTO commands, letting remote attackers copy arbitrary files on the ser…EPSS 97%analysed10.0CVE-2010-4221ProFTPD TELNET IAC handling stack buffer overflow allows remote code executionProFTPD before 1.3.3c contains multiple stack-based buffer overflows in the pr_netio_telnet_gets function in netio.c. A remote attacker can trigger t…EPSS 91%analysed9.8CVE-2019-12815ProFTPD mod_copy arbitrary file copy enables unauthenticated RCEmod_copy in ProFTPD up to 1.3.5b performs an arbitrary file copy without validating the source or destination, letting an unauthenticated remote clie…EPSS 58%analysed9.3CVE-2010-20103Proftpd vulnerabilityA malicious backdoor was embedded in the official ProFTPD 1.3.3c source tarball distributed between November 28 and December 2, 2010. The backdoor im…EPSS 5.1%9.0CVE-2011-4130Proftpd vulnerabilityUse-after-free vulnerability in the Response API in ProFTPD before 1.3.3g allows remote authenticated users to execute arbitrary code via vectors inv…EPSS 13%8.8CVE-2020-9273Proftpd use after free vulnerabilityIn ProFTPD 1.3.7, it is possible to corrupt the memory pool by interrupting the data transfer channel. This triggers a use-after-free in alloc_pool i…EPSS 12%8.7CVE-2026-63090Proftpd heap-based buffer overflow vulnerabilityProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the mod_sftp module that allows authenticated low-privileg…EPSS 0.93%8.6CVE-2026-35025Proftpd link following vulnerabilityProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated FTP users to circumvent Directory ACL …EPSS 0.51%

Source: NIST National Vulnerability Database (record CVE-2004-1602), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.