How severe is CVE-2011-1221?

CVE-2011-1221 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-1221 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1221?

CVE-2011-1221 primarily affects Realnetworks Realplayer. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1221?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-1221 published?

CVE-2011-1221 was published on 2011-10-04 and last updated on 2026-06-16.

CVE-2011-1221

CVE-2011-1221 is a medium-severity vulnerability in Realnetworks Realplayer with a CVSS 2.0 base score of 4.3. 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-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Realnetworks Realplayer
Published: 2011-10-04
Last modified: 2026-06-16

Description

Cross-zone scripting vulnerability in the RealPlayer ActiveX control in RealNetworks RealPlayer 11.0 through 11.1 and 14.0.0 through 14.0.5, RealPlayer SP 1.0 through 1.1.5, and RealPlayer Enterprise 2.0 through 2.1.5 allows remote attackers to inject arbitrary web script or HTML in the Local Zone via a local HTML document, a different vulnerability than CVE-2011-2947.

Frequently asked questions

What is CVE-2011-1221?: Cross-zone scripting vulnerability in the RealPlayer ActiveX control in RealNetworks RealPlayer 11.0 through 11.1 and 14.0.0 through 14.0.5, RealPlayer SP 1.0 through 1.1.5, and RealPlayer Enterprise 2.0 through 2.1.5 allows remote attackers to inject arbitrary web script or HTML in the Local Zone via a local HTML document, a different vulnerability than CVE-2011-2947.
How severe is CVE-2011-1221?: CVE-2011-1221 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-1221 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1221?: CVE-2011-1221 primarily affects Realnetworks Realplayer. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1221?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1221 published?: CVE-2011-1221 was published on 2011-10-04 and last updated on 2026-06-16.

References

http://service.real.com/realplayer/security/08162011_player/en/

Affected products (24)

cpe:2.3:a:realnetworks:realplayer:11.0:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:11.1:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.0:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.1:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:14.0.2:*:*:*:*:*:*:*
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_sp:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer_sp:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer_sp:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer_sp:1.0.5:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer_sp:1.1:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer_sp:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer_sp:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer_sp:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer_sp:1.1.4:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer_sp:1.1.5:*:*:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:2.0:*:enterprise:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:2.1:*:enterprise:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:2.1.2:*:enterprise:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:2.1.3:*:enterprise:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:2.1.4:*:enterprise:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:2.1.5:*:enterprise:*:*:*:*:*

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