CVE-2011-1563

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 74.6% 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 75%
  • Public exploit code is available (Metasploit, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 75%CVSS v2: 10.0Exploit: Metasploit · 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.

Multiple stack-based buffer overflows in the HMI application in DATAC RealFlex RealWin 2.1 (Build 6.1.10.10) and earlier allow remote attackers to execute arbitrary code via (1) a long username in an On_FC_CONNECT_FCS_LOGIN packet, and crafted (2) On_FC_CTAGLIST_FCS_CADDTAG, (3) On_FC_CTAGLIST_FCS_CDELTAG, (4) On_FC_CTAGLIST_FCS_ADDTAGMS, (5) On_FC_RFUSER_FCS_LOGIN, (6) unspecified "On_FC_BINFILE_FCS_*FILE", (7) On_FC_CGETTAG_FCS_GETTELEMETRY, (8) On_FC_CGETTAG_FCS_GETCHANNELTELEMETRY, (9) On_FC_CGETTAG_FCS_SETTELEMETRY, (10) On_FC_CGETTAG_FCS_SETCHANNELTELEMETRY, and (11) On_FC_SCRIPT_FCS_STARTPROG packets to port 910.

CVSS v2.0 (legacy)
10.0HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
10.0(low)
EG Risk
79(Track)
EG Risk 79/100SSVC: 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%
Exploitation75% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
75%
EPSS %ILE
99%
KEV
Not listed

Published

April 5, 2011

Last Modified

April 29, 2026

References (24)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 0× in last 7d / 4× 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. 2026-08-19 16:58 UTCEPSS rescore
  2. 2026-08-18 13:42 UTCEPSS rescore
  3. 2026-08-15 01:25 UTCEPSS rescore
  4. 2026-08-05 19:12 UTCEPSS rescore
  5. 2026-07-26 13:43 UTCEG score recompute▲ 10.00
  6. 2026-07-23 01:04 UTCEG score recompute
  7. 2026-07-23 00:40 UTCEG score recompute▼ 7.30
  8. 2026-07-23 00:08 UTCEG score recompute▲ 7.30
  9. 2026-07-22 21:47 UTCEG score recompute
  10. 2026-07-22 14:03 UTCEPSS rescore
  11. 2026-07-20 17:03 UTCEPSS rescore
  12. 2026-07-20 17:03 UTCEPSS rescore
  13. 2026-07-16 16:58 UTCEPSS rescore
  14. 2026-07-15 16:54 UTCEPSS rescore
  15. 2026-07-15 16:54 UTCEPSS rescore
  16. 2026-07-15 01:55 UTCEPSS rescore
  17. 2026-07-08 15:10 UTCEPSS rescore
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  19. 2026-07-06 02:19 UTCEPSS rescore
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  21. 2026-07-02 14:01 UTCEPSS rescore
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  24. 2026-06-30 23:19 UTCEPSS rescore
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  1. 2026-06-29 14:02 UTCEPSS rescore
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  3. 2026-06-28 04:53 UTCEPSS rescore
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  5. 2026-06-25 13:46 UTCEPSS rescore
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  8. 2026-06-23 21:30 UTCEPSS rescore
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  10. 2026-06-18 17:49 UTCEPSS rescore
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  12. 2026-06-16 17:49 UTCEPSS rescore
  13. 2026-06-15 17:44 UTCEPSS rescore
  14. 2026-06-13 22:57 UTCEPSS rescore
  15. 2026-06-13 22:57 UTCEPSS rescore
  16. 2026-06-12 23:08 UTCEPSS rescore
  17. 2026-06-11 13:56 UTCEPSS rescore
  18. 2026-06-10 22:14 UTCEPSS rescore
  19. 2026-06-10 13:17 UTCEPSS rescore
  20. 2026-06-08 14:14 UTCEPSS rescore
  21. 2026-06-08 14:14 UTCEPSS rescore
  22. 2026-06-07 15:22 UTCEPSS rescore
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  24. 2026-06-06 13:45 UTCEPSS rescore
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  26. 2026-06-05 22:44 UTCEPSS rescore
  27. 2026-06-05 06:08 UTCEPSS rescore
  28. 2026-06-05 06:07 UTCEPSS rescore
  29. 2026-06-02 20:10 UTCEPSS rescore
  30. 2026-06-02 20:10 UTCEPSS rescore
  31. 2026-06-01 13:49 UTCEPSS rescore
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  33. 2026-05-31 00:14 UTCEPSS rescore
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  35. 2026-05-29 13:41 UTCEPSS rescore
  36. 2026-05-29 13:40 UTCEPSS rescore
  37. 2026-05-29 08:22 UTCEG score recompute
  38. 2026-05-29 08:22 UTCGHSA enrichment
  39. 2026-05-28 13:42 UTCEPSS rescore
  40. 2026-05-28 13:42 UTCEPSS rescore
  41. 2026-05-28 13:42 UTCEPSS rescore
  42. 2026-05-27 13:38 UTCEPSS rescore
  43. 2026-05-27 13:38 UTCEPSS rescore
  44. 2026-05-26 13:41 UTCEPSS rescore
  45. 2026-05-26 13:41 UTCEPSS rescore
  46. 2026-05-24 16:43 UTCEPSS rescore
  47. 2026-05-22 21:15 UTCEPSS rescore
  48. 2026-05-22 21:15 UTCEPSS rescore
  49. 2026-05-22 21:15 UTCEPSS rescore
  50. 2026-05-20 22:37 UTCEPSS rescore
  51. 2026-05-20 22:37 UTCEPSS rescore
  52. 2026-05-20 22:37 UTCEPSS rescore
  53. 2026-05-20 11:21 UTCEPSS rescore
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  55. 2026-05-20 11:21 UTCEPSS rescore
  56. 2026-05-18 21:29 UTCEPSS rescore
  57. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(3 references)

Working exploit code is in the public domain (2 Metasploit modules) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-17025
    First seen Mar 22, 2011

    DATAC RealWin - Multiple Vulnerabilities

    Open source ↗
  • Metasploitexploit/windows/scada/realwin_on_fcs_login✓ verified
    First seen Mar 21, 2011

    RealWin SCADA Server DATAC Login Buffer Overflow

    Open source ↗
  • Metasploitexploit/windows/scada/realwin_on_fc_binfile_a✓ verified
    First seen Mar 21, 2011

    DATAC RealWin SCADA Server 2 On_FC_CONNECT_FCS_a_FILE Buffer Overflow

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2011-1563?
CVE-2011-1563 is a high vulnerability published on April 5, 2011. Multiple stack-based buffer overflows in the HMI application in DATAC RealFlex RealWin 2.1 (Build 6.1.10.10) and earlier allow remote attackers to execute arbitrary code via (1) a long username in an OnFCCONNECTFCSLOGIN packet, and crafted (2) OnFCCTAGLISTFCSCADDTAG, (3) OnFCCTAGLISTFCSCDELTAG, (4)…
When was CVE-2011-1563 disclosed?
CVE-2011-1563 was first published in the National Vulnerability Database on April 5, 2011, 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-2011-1563 actively exploited?
CVE-2011-1563 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75% 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-2011-1563?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-1563, 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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