Microsoft Internet Explorer Messaging API Information Disclosure Vulnerability

Added to KEV
2022-05-24
Federal due date
2022-06-14
Vendor
Microsoft
Product
Internet Explorer
EPSS
96.6th percentile (score 0.283, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2016-3298

CISA short description

An information disclosure vulnerability exists when the Microsoft Internet Messaging API improperly handles objects in memory. An attacker who successfully exploited this vulnerability could allow the attacker to test for the presence of files on disk.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.