CVE-2011-1575: n/a vulnerability

CVE-2011-1575: The STARTTLS implementation in ftp_parser.c in Pure-FTPd before 1.0.30 does not properly restrict I/O buffe...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 22:28 UTC (UTC+00:00)

Security readout for executives and security teams

Pure-FTPd versions before 1.0.30 could mishandle the switch from cleartext FTP to encrypted STARTTLS. An attacker positioned between client and server could inject an FTP command that is later processed inside the encrypted session. This is mainly urgent for organizations still running legacy Pure-FTPd with STARTTLS exposed on untrusted networks. Exposure is likely limited to Pure-FTPd deployments older than 1.0.30 that support STARTTLS/FTPS, especially internet-facing FTP services or internal services reachable from untrusted network segments. Treat this as a legacy exposure cleanup item with moderate urgency. Prioritize internet-facing FTP services, third-party hosted file transfer systems, and systems handling sensitive credentials or regulated data. Mitigation focus: Upgrade Pure-FTPd to 1.0.30 or a vendor package containing the CVE fix.; Apply relevant SUSE, openSUSE, Red Hat, or distribution security updates where applicable.; Restrict FTP/FTPS access to trusted networks until legacy instances are patched..

Prepared: Jun 24, 2026, 13:28 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 23, 2011, 22:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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4Source links

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Source materials

CVE List V5 sourceCVE List V5
https://bugzilla.redhat.com/show_bug.cgi?id=683221CVE reference · x_refsource_CONFIRM
https://bugzilla.novell.com/show_bug.cgi?id=686590CVE reference · x_refsource_CONFIRM
https://github.com/jedisct1/pure-ftpd/commit/65c4d4ad331e94661de763e9b5304d28698999c4CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

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