CVE-2011-4256

CVE-2011-4256 is a critical-severity vulnerability in Realnetworks Realplayer with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Description

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.

Frequently asked questions

What is CVE-2011-4256?
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.
How severe is CVE-2011-4256?
CVE-2011-4256 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2011-4256 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4256?
CVE-2011-4256 primarily affects Realnetworks Realplayer. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4256?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-4256 published?
CVE-2011-4256 was published on 2011-11-24 and last updated on 2026-06-16.

References

Affected products (38)

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