How severe is CVE-2010-4388?

CVE-2010-4388 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2010-4388 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-4388?

CVE-2010-4388 primarily affects Realnetworks Realplayer. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-4388?

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

When was CVE-2010-4388 published?

CVE-2010-4388 was published on 2010-12-14 and last updated on 2026-06-16.

CVE-2010-4388

CVE-2010-4388 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-20.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Realnetworks Realplayer
Published: 2010-12-14
Last modified: 2026-06-16

Description

The (1) Upsell.htm, (2) Main.html, and (3) Custsupport.html components in RealNetworks RealPlayer 11.0 through 11.1, RealPlayer SP 1.0 through 1.1.5, and RealPlayer Enterprise 2.1.2 and 2.1.3 allow remote attackers to inject code into the RealOneActiveXObject process, and consequently bypass intended Local Machine Zone restrictions and load arbitrary ActiveX controls, via unspecified vectors.

Frequently asked questions

What is CVE-2010-4388?: The (1) Upsell.htm, (2) Main.html, and (3) Custsupport.html components in RealNetworks RealPlayer 11.0 through 11.1, RealPlayer SP 1.0 through 1.1.5, and RealPlayer Enterprise 2.1.2 and 2.1.3 allow remote attackers to inject code into the RealOneActiveXObject process, and consequently bypass intended Local Machine Zone restrictions and load arbitrary ActiveX controls, via unspecified vectors.
How severe is CVE-2010-4388?: CVE-2010-4388 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2010-4388 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-4388?: CVE-2010-4388 primarily affects Realnetworks Realplayer. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-4388?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2010-4388 published?: CVE-2010-4388 was published on 2010-12-14 and last updated on 2026-06-16.

References

Affected products (19)

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:11.0.3:*:*:*:*:*:*:*
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_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:2.1.2:*:enterprise:*:*:*:*:*
cpe:2.3:a:realnetworks:realplayer:2.1.3:*:enterprise:*:*:*:*:*

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