CVE-2011-5227: Stack-based buffer overflow in the Syslog service (nssyslogd.exe) in Enterasys Network Management Suite (NMS)

Q: How do I fix CVE-2011-5227?

netsight: upgrade to newer than 4.1.0.79; netsight: upgrade to newer than 4.1.0.79. Exact commands for each OS are on this page.

Q: Is CVE-2011-5227 being exploited?

CVE-2011-5227 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2011-5227 affect?

CVE-2011-5227 affects netsight, netsight. Severity is high (CVSS 10.0). Stack-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.

Q: How urgent is CVE-2011-5227?

Priority 65/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference

This week

HIGH 10.0UPGRADEUPGRADE

CVE-2011-5227 is a high-severity flaw (CVSS 10.0) affecting netsight, netsight. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-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.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	77.0% (top 1%)
CISA exploited list	No
Weakness	CWE-119
Published	2012-10-25
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: enterasys

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2012-10-25 17:55 UTCPublished CVE record published
2026-06-16 23:36 UTCUpdated Record last modified

enterasys netsight UPGRADE

Affected: <= 4.1.0.79

Fixed in: newer than 4.1.0.79

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy netsight || rpm -q netsight || netsight --version

2. UPGRADE to newer than 4.1.0.79 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade netsight

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade netsight

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

enterasys netsight UPGRADE

Affected: <= 4.1.0.79

Fixed in: newer than 4.1.0.79

Safe to downgrade to: no unaffected older release

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Enterasys NetSight - 'nssyslogd.exe' Remote Buffer Overflow (Metasploit)
Metasploit: Enterasys NetSight nssyslogd.exe Buffer Overflow

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-5227?

netsight: upgrade to newer than 4.1.0.79; netsight: upgrade to newer than 4.1.0.79. Exact commands for each OS are on this page.

Is CVE-2011-5227 being exploited?

CVE-2011-5227 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-5227 affect?

CVE-2011-5227 affects netsight, netsight. Severity is high (CVSS 10.0). Stack-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.

How urgent is CVE-2011-5227?

Priority 65/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference

References

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