CVE-2016-3298
Published: May 24, 2022
Official 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.
CISA KEV Advisory
Microsoft Internet Explorer Messaging API Information Disclosure Vulnerability
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.
Apply updates per vendor instructions.
Risk Analysis
This vulnerability in Microsoft Internet Messaging API allows an attacker to check for the presence of files on disk due to improper handling of objects in memory. The high EPSS score and inclusion in CISA's KEV catalog indicate a significant likelihood of exploitation and confirmed real-world attacks.
Active exploitation of this vulnerability has been observed in the wild. Given the nature of the flaw, it is likely remotely exploitable.
Ensure all Microsoft products are kept up-to-date with the latest security patches. Implement robust endpoint detection and response solutions to monitor for suspicious activity.
Technical Analysis
CVE-2016-3298 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2016-3298 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2016-3298 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1