How severe is CVE-2016-3367?

CVE-2016-3367 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-3367 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-3367?

CVE-2016-3367 affects Microsoft Silverlight. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-3367?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-3367 published?

CVE-2016-3367 was published on 2016-09-14 and last updated on 2026-06-17.

CVE-2016-3367

CVE-2016-3367 is a high-severity vulnerability in Microsoft Silverlight with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 18% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.3
EPSS exploit prediction: 18% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Silverlight
Published: 2016-09-14
Last modified: 2026-06-17

Description

StringBuilder in Microsoft Silverlight 5 before 5.1.50709.0 does not properly allocate memory for string-insert and string-append operations, which allows remote attackers to execute arbitrary code via a crafted web site, aka "Microsoft Silverlight Memory Corruption Vulnerability."

Frequently asked questions

What is CVE-2016-3367?: StringBuilder in Microsoft Silverlight 5 before 5.1.50709.0 does not properly allocate memory for string-insert and string-append operations, which allows remote attackers to execute arbitrary code via a crafted web site, aka "Microsoft Silverlight Memory Corruption Vulnerability."
How severe is CVE-2016-3367?: CVE-2016-3367 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-3367 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-3367?: CVE-2016-3367 affects Microsoft Silverlight. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-3367?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-3367 published?: CVE-2016-3367 was published on 2016-09-14 and last updated on 2026-06-17.

References

Affected products (1)

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

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