CVE-2011-4257

CVE-2011-4257 is a none vulnerability published on November 24, 2011. The Cook codec in RealNetworks RealPlayer before 15.0.0 allows remote attackers to execute arbitrary code via crafted channel data.

CVE-2011-4257 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.

CVE-2011-4257 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-4257, 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.