How severe is CVE-2015-6166?

CVE-2015-6166 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2015-6166 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-6166?

CVE-2015-6166 affects Microsoft Silverlight. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-6166?

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-2015-6166 published?

CVE-2015-6166 was published on 2015-12-09 and last updated on 2026-06-17.

CVE-2015-6166

CVE-2015-6166 is a critical-severity vulnerability in Microsoft Silverlight with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 14% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Silverlight
Published: 2015-12-09
Last modified: 2026-06-17

Description

Microsoft Silverlight 5 before 5.1.41105.00 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds read or write access) via unspecified open and close requests, aka "Microsoft Silverlight RCE Vulnerability."

Frequently asked questions

What is CVE-2015-6166?: Microsoft Silverlight 5 before 5.1.41105.00 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds read or write access) via unspecified open and close requests, aka "Microsoft Silverlight RCE Vulnerability."
How severe is CVE-2015-6166?: CVE-2015-6166 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2015-6166 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-6166?: CVE-2015-6166 affects Microsoft Silverlight. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-6166?: 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-2015-6166 published?: CVE-2015-6166 was published on 2015-12-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microsoft:silverlight:5.0:*:*:*:*:*:*:*

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