CVE-2009-5121
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 · uneditedWebsense Email Security 7.1 before Hotfix 4 allows remote attackers to bypass the sender-based blacklist by using the 8BITMIME EHLO keyword in the SMTP session.
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 · moderate confidenceWebsense Email Security 7.1 before Hotfix 4 contains a security bypass vulnerability where remote attackers can circumvent sender-based blacklists by including the 8BITMIME EHLO keyword in SMTP sessions, allowing malicious senders to bypass email filtering controls.
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 data= 7.1CVSS 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
- Low
- Authentication
- None
- Confidentiality
- None
- Integrity
- Partial
- Availability
- None
AV:N/AC:L/Au:N/C:N/I:P/A:N
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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Confirm Websense Email Security is installedLocate the Websense Email Security installation directory or check system services for 'Websense Email Security' or 'Websense' processesAffected if The product is not present on the system, then this CVE does not apply
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Identify the exact version numberAccess the Websense Email Security administrative interface, check the About or Version section in the management console, or query the installed software version through the system registry or package managerAffected if The version is not 7.1 (e.g., 6.x, 8.x, or different), then this CVE does not apply
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Determine if Hotfix 4 is appliedCheck the installed hotfixes, patches, or updates within the Websense Email Security administrative console, or review the system's installed updates list for Hotfix 4Affected if Hotfix 4 has not been applied to version 7.1, the system is vulnerable; if Hotfix 4 is confirmed installed or the version shows 7.1 with Hotfix 4 applied, the system is not affected by this CVE
The environment is affected if Websense Email Security version 7.1 is installed AND Hotfix 4 has not been applied, allowing the 8BITMIME EHLO bypass to circumvent sender-based blacklists.
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 dataApply Hotfix 4 to Websense Email Security 7.1 to remediate this vulnerability. Additionally, consider implementing additional sender verification mechanisms as a defense-in-depth measure.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2009-5121 — 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-2009-5121 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data