CVE-2011-5227
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 · uneditedStack-based buffer overflow in the Syslog service (nssyslogd.exe) in Enterasys Network Management Suite (NMS) before 4.1.0.80 allows remote attackers to execute arbitrary code via a long PRIO field in a message to UDP port 514.
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 confidenceStack-based buffer overflow in the Syslog service (nssyslogd.exe) in Enterasys Network Management Suite before 4.1.0.80 allows remote attackers to execute arbitrary code via a long PRIO field in a syslog message sent to UDP port 514.
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<= 4.1.0.79CVSS 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
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:N/AC:L/Au:N/C:C/I:C/A:C
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 Enterasys Netsight is installedLook for the nssyslogd.exe process in Task Manager or check for the presence of the Enterasys Netsight installation directory on the systemAffected if nssyslogd.exe is found running as a process or service on the system
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Check Netsight versionRight-click nssyslogd.exe, select Properties, and view the File Version or Product Version field. Alternatively, check the Enterasys Netsight console or installer for the version numberAffected if The version is 4.1.0.79 or earlier, or if the version cannot be determined and is below 4.1.0.80
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Verify syslog service is listening on UDP 514Run 'netstat -an | findstr :514' or use a port scanner to confirm UDP port 514 is open and bound to a serviceAffected if UDP port 514 is open and the nssyslogd.exe service is listening
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Check network exposure to UDP 514Review firewall rules and network ACLs to determine if UDP port 514 is accessible from untrusted networks or the internetAffected if UDP port 514 is exposed to untrusted network segments or the internet without filtering
The system is affected if Enterasys Netsight is installed with nssyslogd.exe version 4.1.0.79 or earlier and the syslog service is exposed on UDP port 514.
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.
dbcve · scopedUpgrade to Enterasys NMS version 4.1.0.80 or later to obtain the patched nssyslogd.exe; if immediate upgrade is not feasible, restrict network access to UDP port 514.
Enterasys Network Management Suite (NMS) 4.1.0.80 or later
- 1. Confirm current Netsight/NMS version by checking the installed software or system information
- 2. Schedule a maintenance window for the upgrade
- 3. Back up the current Netsight configuration and database
- 4. Download Enterasys Network Management Suite version 4.1.0.80 or later from the official Enterasys/Extreme Networks support portal
- 5. Stop all Netsight services including the Syslog service (nssyslogd.exe) before upgrading
- 6. Install version 4.1.0.80 or newer following the vendor's installation documentation
- 7. Verify the Syslog service (nssyslogd.exe) is running with the updated version
- 8. Confirm the upgrade was successful by checking the NMS version information
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2011-5227 — 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-2011-5227 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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- 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