CVE-2011-4256

NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 4%CVSS: —Exploit: NoneExposed: 0

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

The RV30 codec in RealNetworks RealPlayer before 15.0.0 and Mac RealPlayer before 12.0.0.1703 does not initialize an unspecified index value, which allows remote attackers to execute arbitrary code via unknown vectors.

CVSS v3
—
EG Score
0.0(none)
EPSS
90.0%
KEV
Not listed

Published

November 24, 2011

Last Modified

April 29, 2026

References (2)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 44× 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. 2026-07-06 16:23 UTCEPSS rescore
  2. 2026-07-06 02:19 UTCEPSS rescore
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  20. 2026-06-23 21:30 UTCEPSS rescore
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  1. 2026-06-19 19:22 UTCEPSS rescore
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  22. 2026-06-05 22:44 UTCEPSS rescore
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  31. 2026-05-31 00:14 UTCEPSS rescore
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  35. 2026-05-29 06:11 UTCEG score recompute
  36. 2026-05-29 06:11 UTCGHSA enrichment
  37. 2026-05-28 13:42 UTCEPSS rescore
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  40. 2026-05-27 13:38 UTCEPSS rescore
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  42. 2026-05-26 13:41 UTCEPSS rescore
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  44. 2026-05-26 07:16 UTCEPSS rescore
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  46. 2026-05-24 16:43 UTCEPSS rescore
  47. 2026-05-20 22:37 UTCEPSS rescore
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  49. 2026-05-20 22:37 UTCEPSS rescore
  50. 2026-05-20 11:21 UTCEPSS rescore
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  52. 2026-05-20 11:21 UTCEPSS rescore
  53. 2026-05-18 21:29 UTCEPSS rescore
  54. 2026-05-18 21:29 UTCEPSS rescore

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Frequently asked(4)

What is CVE-2011-4256?
CVE-2011-4256 is a none vulnerability published on November 24, 2011. The RV30 codec in RealNetworks RealPlayer before 15.0.0 and Mac RealPlayer before 12.0.0.1703 does not initialize an unspecified index value, which allows remote attackers to execute arbitrary code via unknown vectors.
When was CVE-2011-4256 disclosed?
CVE-2011-4256 was first published in the National Vulnerability Database on November 24, 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-2011-4256 actively exploited?
CVE-2011-4256 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2011-4256?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-4256, 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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