CVE-2011-5227

HIGHCVSS v2 · 10.010.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 10.0 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:C/I:C/A:C. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 77.0% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Weaponized
10.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 77%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 77%CVSS v2: 10.0Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v2.0 (legacy)
10.0HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
10.0(low)
EG Risk
80(Track)
EG Risk 80/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation77% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
77%
EPSS %ILE
100%
KEV
Not listed

Published

October 25, 2012

Last Modified

April 29, 2026

References (12)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 2× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-27 14:20 UTCEPSS rescore
  2. 2026-08-21 23:43 UTCEPSS rescore
  3. 2026-08-19 16:59 UTCEPSS rescore
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  7. 2026-08-04 15:04 UTCEPSS rescore
  8. 2026-07-28 15:31 UTCEPSS rescore
  9. 2026-07-26 13:44 UTCEG score recompute▲ 10.00
  10. 2026-07-23 01:06 UTCEG score recompute▼ 7.70
  11. 2026-07-23 00:10 UTCEG score recompute▲ 7.70
  12. 2026-07-22 21:48 UTCEG score recompute
  13. 2026-07-22 14:04 UTCEPSS rescore
  14. 2026-07-22 14:04 UTCEPSS rescore
  15. 2026-07-21 15:21 UTCEPSS rescore
  16. 2026-07-20 17:03 UTCEPSS rescore
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  25. 2026-07-08 15:10 UTCEPSS rescore
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  1. 2026-07-08 15:10 UTCEPSS rescore
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  3. 2026-07-01 15:02 UTCEPSS rescore
  4. 2026-06-30 23:19 UTCEPSS rescore
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  6. 2026-06-27 03:05 UTCEPSS rescore
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  8. 2026-06-25 13:46 UTCEPSS rescore
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  20. 2026-06-13 22:57 UTCEPSS rescore
  21. 2026-06-12 23:08 UTCEPSS rescore
  22. 2026-06-11 13:56 UTCEPSS rescore
  23. 2026-06-10 22:14 UTCEPSS rescore
  24. 2026-06-10 13:18 UTCEPSS rescore
  25. 2026-06-06 13:45 UTCEPSS rescore
  26. 2026-06-06 13:45 UTCEPSS rescore
  27. 2026-06-05 22:44 UTCEPSS rescore
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  31. 2026-06-02 20:10 UTCEPSS rescore
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  33. 2026-06-01 13:49 UTCEPSS rescore
  34. 2026-05-31 22:28 UTCEPSS rescore
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  36. 2026-05-31 00:14 UTCEPSS rescore
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  38. 2026-05-29 13:41 UTCEPSS rescore
  39. 2026-05-29 02:05 UTCEG score recompute
  40. 2026-05-29 02:05 UTCGHSA enrichment
  41. 2026-05-22 21:15 UTCEPSS rescore
  42. 2026-05-22 21:15 UTCEPSS rescore
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  44. 2026-05-20 22:37 UTCEPSS rescore
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  47. 2026-05-20 11:21 UTCEPSS rescore
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  49. 2026-05-20 11:21 UTCEPSS rescore
  50. 2026-05-18 21:29 UTCEPSS rescore
  51. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-23887✓ verified
    First seen Jan 4, 2013

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

    Open source ↗
  • Metasploitexploit/windows/misc/enterasys_netsight_syslog_bof✓ verified
    First seen Dec 19, 2011

    Enterasys NetSight nssyslogd.exe Buffer Overflow

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2011-5227?
CVE-2011-5227 is a high vulnerability published on October 25, 2012. 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.
When was CVE-2011-5227 disclosed?
CVE-2011-5227 was first published in the National Vulnerability Database on October 25, 2012, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-5227 actively exploited?
CVE-2011-5227 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 77% probability of exploitation in the next 30 days, which ranks it in the top 0.5% of all scored CVEs.
How do I remediate CVE-2011-5227?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-5227, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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