CVE-2011-1575

The STARTTLS implementation in ftp_parser.c in Pure-FTPd before 1.0.30 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted FTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.

Published: 2011-05-23 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-1575 is rated Moderate Risk (62.6/100): CVSS Medium severity, with high exploitation likelihood (EPSS 33.34%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +11.16% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-1575

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 22.18% 33.34% +11.16%
2 2025-03-30 38.78% 22.18% -16.59%
3 2025-03-29 — 38.78% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-1575

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2011-1575

OS Trackers for CVE-2011-1575

vendor priority summary link
debian low CVE-2011-1575 low priority: Debian including 1 source packages (pure-ftpd), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2011-1575
gentoo normal CVE-2011-1575: 1 GLSA(s) (201110-25), 1 atom(s) (net-ftp/pure-ftpd); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-1575
ubuntu high CVE-2011-1575 high priority: Ubuntu including 1 source packages (pure-ftpd), 11 status rows across 11 suites (dapper, hardy, lucid, maverick, natty, oneiric, precise, quantal, raring, saucy, upstream): ignored 5, not-affected 5, released 1. https://ubuntu.com/security/CVE-2011-1575

Affected software / configurations for CVE-2011-1575

Vendor Product Version Raw CPE
pureftpd pure-ftpd <= 1.0.29 cpe:2.3:a:pureftpd:pure-ftpd:*:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.90 cpe:2.3:a:pureftpd:pure-ftpd:0.90:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.91 cpe:2.3:a:pureftpd:pure-ftpd:0.91:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.92 cpe:2.3:a:pureftpd:pure-ftpd:0.92:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.93 cpe:2.3:a:pureftpd:pure-ftpd:0.93:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.94 cpe:2.3:a:pureftpd:pure-ftpd:0.94:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.95 cpe:2.3:a:pureftpd:pure-ftpd:0.95:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.95-pre1 cpe:2.3:a:pureftpd:pure-ftpd:0.95-pre1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.95-pre2 cpe:2.3:a:pureftpd:pure-ftpd:0.95-pre2:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.95-pre3 cpe:2.3:a:pureftpd:pure-ftpd:0.95-pre3:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.95-pre4 cpe:2.3:a:pureftpd:pure-ftpd:0.95-pre4:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.95.1 cpe:2.3:a:pureftpd:pure-ftpd:0.95.1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.95.2 cpe:2.3:a:pureftpd:pure-ftpd:0.95.2:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.96 cpe:2.3:a:pureftpd:pure-ftpd:0.96:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.96.1 cpe:2.3:a:pureftpd:pure-ftpd:0.96.1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.96pre1 cpe:2.3:a:pureftpd:pure-ftpd:0.96pre1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97-final cpe:2.3:a:pureftpd:pure-ftpd:0.97-final:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.1 cpe:2.3:a:pureftpd:pure-ftpd:0.97.1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.2 cpe:2.3:a:pureftpd:pure-ftpd:0.97.2:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.3 cpe:2.3:a:pureftpd:pure-ftpd:0.97.3:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.4 cpe:2.3:a:pureftpd:pure-ftpd:0.97.4:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.5 cpe:2.3:a:pureftpd:pure-ftpd:0.97.5:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.6 cpe:2.3:a:pureftpd:pure-ftpd:0.97.6:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.7 cpe:2.3:a:pureftpd:pure-ftpd:0.97.7:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.7pre1 cpe:2.3:a:pureftpd:pure-ftpd:0.97.7pre1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.7pre2 cpe:2.3:a:pureftpd:pure-ftpd:0.97.7pre2:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97.7pre3 cpe:2.3:a:pureftpd:pure-ftpd:0.97.7pre3:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97pre1 cpe:2.3:a:pureftpd:pure-ftpd:0.97pre1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97pre2 cpe:2.3:a:pureftpd:pure-ftpd:0.97pre2:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97pre3 cpe:2.3:a:pureftpd:pure-ftpd:0.97pre3:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97pre4 cpe:2.3:a:pureftpd:pure-ftpd:0.97pre4:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.97pre5 cpe:2.3:a:pureftpd:pure-ftpd:0.97pre5:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98-final cpe:2.3:a:pureftpd:pure-ftpd:0.98-final:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98.1 cpe:2.3:a:pureftpd:pure-ftpd:0.98.1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98.2 cpe:2.3:a:pureftpd:pure-ftpd:0.98.2:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98.2a cpe:2.3:a:pureftpd:pure-ftpd:0.98.2a:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98.3 cpe:2.3:a:pureftpd:pure-ftpd:0.98.3:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98.4 cpe:2.3:a:pureftpd:pure-ftpd:0.98.4:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98.5 cpe:2.3:a:pureftpd:pure-ftpd:0.98.5:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98.6 cpe:2.3:a:pureftpd:pure-ftpd:0.98.6:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98.7 cpe:2.3:a:pureftpd:pure-ftpd:0.98.7:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98pre1 cpe:2.3:a:pureftpd:pure-ftpd:0.98pre1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.98pre2 cpe:2.3:a:pureftpd:pure-ftpd:0.98pre2:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99 cpe:2.3:a:pureftpd:pure-ftpd:0.99:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99.1 cpe:2.3:a:pureftpd:pure-ftpd:0.99.1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99.1a cpe:2.3:a:pureftpd:pure-ftpd:0.99.1a:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99.1b cpe:2.3:a:pureftpd:pure-ftpd:0.99.1b:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99.2 cpe:2.3:a:pureftpd:pure-ftpd:0.99.2:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99.2a cpe:2.3:a:pureftpd:pure-ftpd:0.99.2a:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99.3 cpe:2.3:a:pureftpd:pure-ftpd:0.99.3:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99.4 cpe:2.3:a:pureftpd:pure-ftpd:0.99.4:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99.9 cpe:2.3:a:pureftpd:pure-ftpd:0.99.9:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99a cpe:2.3:a:pureftpd:pure-ftpd:0.99a:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99b cpe:2.3:a:pureftpd:pure-ftpd:0.99b:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99pre1 cpe:2.3:a:pureftpd:pure-ftpd:0.99pre1:*:*:*:*:*:*:*
pureftpd pure-ftpd 0.99pre2 cpe:2.3:a:pureftpd:pure-ftpd:0.99pre2:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.0 cpe:2.3:a:pureftpd:pure-ftpd:1.0.0:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.1 cpe:2.3:a:pureftpd:pure-ftpd:1.0.1:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.2 cpe:2.3:a:pureftpd:pure-ftpd:1.0.2:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.3 cpe:2.3:a:pureftpd:pure-ftpd:1.0.3:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.4 cpe:2.3:a:pureftpd:pure-ftpd:1.0.4:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.5 cpe:2.3:a:pureftpd:pure-ftpd:1.0.5:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.6 cpe:2.3:a:pureftpd:pure-ftpd:1.0.6:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.7 cpe:2.3:a:pureftpd:pure-ftpd:1.0.7:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.8 cpe:2.3:a:pureftpd:pure-ftpd:1.0.8:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.9 cpe:2.3:a:pureftpd:pure-ftpd:1.0.9:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.10 cpe:2.3:a:pureftpd:pure-ftpd:1.0.10:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.11 cpe:2.3:a:pureftpd:pure-ftpd:1.0.11:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.12 cpe:2.3:a:pureftpd:pure-ftpd:1.0.12:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.13a cpe:2.3:a:pureftpd:pure-ftpd:1.0.13a:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.14 cpe:2.3:a:pureftpd:pure-ftpd:1.0.14:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.15 cpe:2.3:a:pureftpd:pure-ftpd:1.0.15:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.16a cpe:2.3:a:pureftpd:pure-ftpd:1.0.16a:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.16b cpe:2.3:a:pureftpd:pure-ftpd:1.0.16b:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.16c cpe:2.3:a:pureftpd:pure-ftpd:1.0.16c:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.17 cpe:2.3:a:pureftpd:pure-ftpd:1.0.17:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.17a cpe:2.3:a:pureftpd:pure-ftpd:1.0.17a:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.18 cpe:2.3:a:pureftpd:pure-ftpd:1.0.18:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.19 cpe:2.3:a:pureftpd:pure-ftpd:1.0.19:*:*:*:*:*:*:*
pureftpd pure-ftpd 1.0.20 cpe:2.3:a:pureftpd:pure-ftpd:1.0.20:*:*:*:*:*:*:*

References for CVE-2011-1575

URL Tags
http://archives.pureftpd.org/archives.cgi?100:mss:3906:201103:cpeojfkblajnpinkeadd
http://archives.pureftpd.org/archives.cgi?100:mss:3910:201103:cpeojfkblajnpinkeadd Patch
http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html
http://lists.opensuse.org/opensuse-updates/2011-05/msg00029.html
http://openwall.com/lists/oss-security/2011/04/11/14
http://openwall.com/lists/oss-security/2011/04/11/3
http://openwall.com/lists/oss-security/2011/04/11/7
http://openwall.com/lists/oss-security/2011/04/11/8
http://secunia.com/advisories/43988 Vendor Advisory
http://secunia.com/advisories/44548
http://www.pureftpd.org/project/pure-ftpd/news
https://bugzilla.novell.com/show_bug.cgi?id=686590 Patch
https://bugzilla.redhat.com/show_bug.cgi?id=683221
https://github.com/jedisct1/pure-ftpd/commit/65c4d4ad331e94661de763e9b5304d28698999c4 Patch
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