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CVE-2016-3367

37
FAUCET Score

CVE-2016-3367 is a memory corruption vulnerability in Microsoft Silverlight 5, specifically affecting versions prior to 5.1.50709.0. This flaw stems from improper memory allocation during string-insert and string-append operations within the StringBuilder component. With a CVSS score of 8.8 (High), it allows remote attackers to execute arbitrary code simply by tricking a user into visiting a crafted website. Despite its high severity and potential for complete compromise (confidentiality, integrity, availability), there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
5.0CPE matchmatch criteria
cpe:2.3:a:microsoft:silverlight:5.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
17.79%
Probability of exploitation in next 30 days
EPSS Percentile
96.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.1779 is in the 97th percentile among its peer group of 14,848 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: Microsoft Silverlight 5 Developer Runtime when installed on Apple Mac OS (Intel-based)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Silverlight 5 Developer Runtime when installed on Microsoft Windows (32-bit)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Silverlight 5 Developer Runtime when installed on Microsoft Windows (x64-based)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Silverlight 5 when installed on Apple Mac OS (Intel-based)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Silverlight 5 when installed on Microsoft Windows (32-bit)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Silverlight 5 when installed on Microsoft Windows (x64-based)
View patch

Vendor Advisories (1)

microsoft2016-Sep/CVE-2016-3367Important

Microsoft Silverlight Memory Corruption Vulnerability

Sep 13, 2016

References

docs.microsoft.com / en-us/security-updates/securitybulletins/2016/ms16-109
securityfocus.com / bid/92837
securitytracker.com / id/1036795