CVE-2011-1430
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe STARTTLS implementation in the server in Ipswitch IMail 11.03 and earlier 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, a similar issue to CVE-2011-0411.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe STARTTLS implementation in Ipswitch IMail 11.03 and earlier has improper I/O buffering control during the TLS handshake transition. An attacker positioned as a man-in-the-middle can inject SMTP commands by sending cleartext commands that get processed after TLS negotiation completes, allowing session hijacking or credential theft in what should be an encrypted channel.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versions<= 11.03= 5.0= 5.0.5= 5.0.6= 5.0.7= 5.0.8= 6.00= 6.0= 6.0.1= 6.0.2= 6.0.3CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- M
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- Partial
AV:N/AC:M/Au:N/C:P/I:P/A:P
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Ipswitch IMail installationCheck for IMail service or Ipswitch installation directory (typically C:\Ipswitch\IMail or C:\Program Files\Ipswitch\IMail)Affected if Ipswitch IMail server software is present on the system
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Determine installed IMail versionCheck the version of the imailsrv.exe or IMail service, or look for version information in the registry under HKLM\Software\Ipswitch\IMailAffected if Installed version matches or is earlier than 11.03, or is one of: 5.0, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 6.00, 6.0, 6.0.1, 6.0.2, 6.0.3
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Verify STARTTLS is enabledExamine SMTP server configuration settings in the IMail administrative interface or configuration files to confirm STARTTLS support is activeAffected if STARTTLS is enabled and advertised as an SMTP capability
If Ipswitch IMail is installed with a version at or below 11.03 (or matching any affected version listed) and STARTTLS is enabled, the environment is vulnerable to command injection during the TLS handshake transition.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade to a patched version of Ipswitch IMail Server, or if no patch is available, consider implementing additional network-level controls to prevent MITM attacks on SMTP connections.
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2011-1430 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2011-1430 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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