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CVE Record

CVE-2011-0411: The STARTTLS implementation in Postfix 2.4.x before 2.4.16, 2.5.x before 2.5.12, 2.6.x before 2.6.9, and 2....

The STARTTLS implementation in Postfix 2.4.x before 2.4.16, 2.5.x before 2.5.12, 2.6.x before 2.6.9, and 2.7.x before 2.7.3 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2011-0411 affects older Postfix mail servers using STARTTLS. A network attacker positioned between mail servers could inject a plaintext SMTP command that Postfix processes after TLS starts, undermining session integrity. This is mainly a concern for legacy, unpatched mail infrastructure. Exposure is most likely on internet-facing or transit SMTP systems still running affected Postfix branches. Modern, vendor-supported Postfix packages are less likely affected, but legacy appliances or unmanaged mail relays should be checked. Treat this as a legacy mail-platform hygiene issue. It is not marked as known exploited in the provided evidence, but affected public SMTP infrastructure could allow tampering by a network-positioned attacker. Mitigation focus: Upgrade Postfix to the fixed version for the deployed branch.; Apply fixed packages from the relevant operating system vendor advisory.; Prioritize internet-facing SMTP relays and mail gateways..

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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2Source links

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