How severe is CVE-2011-4257?

CVE-2011-4257 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2011-4257 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4257?

CVE-2011-4257 primarily affects Realnetworks Realplayer. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4257?

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-2011-4257 published?

CVE-2011-4257 was published on 2011-11-24 and last updated on 2026-06-16.

CVE-2011-4257

CVE-2011-4257 is a critical-severity vulnerability in Realnetworks Realplayer with a CVSS 2.0 base score of 9.3. 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

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Realnetworks Realplayer
Published: 2011-11-24
Last modified: 2026-06-16

Description

The Cook codec in RealNetworks RealPlayer before 15.0.0 allows remote attackers to execute arbitrary code via crafted channel data.

Frequently asked questions

What is CVE-2011-4257?: The Cook codec in RealNetworks RealPlayer before 15.0.0 allows remote attackers to execute arbitrary code via crafted channel data.
How severe is CVE-2011-4257?: CVE-2011-4257 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2011-4257 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4257?: CVE-2011-4257 primarily affects Realnetworks Realplayer. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4257?: 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-2011-4257 published?: CVE-2011-4257 was published on 2011-11-24 and last updated on 2026-06-16.

References

http://service.real.com/realplayer/security/11182011_player/en/

Affected products (30)

cpe:2.3:a:realnetworks:realplayer:*:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:4:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:5:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:6:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:7:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:8:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:10.0:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:10.5:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.0:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.0.1:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.0.2:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.0.2.1744:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.0.2.2315:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.0.3:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.0.4:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.0.5:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.1:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.1.3:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11_build_6.0.14.748:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:12.0.0.1444:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:12.0.0.1548:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.0:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.1:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.1.609:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.1.633:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.2:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.3:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.4:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.5:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.6:*:*:*:*:*:*:*

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