CVE-2017-11774
Published: November 3, 2021
Official Description
Microsoft Office Outlook contains a security feature bypass vulnerability due to improperly handling objects in memory. Successful exploitation allows an attacker to execute commands.
CISA KEV Advisory
Microsoft Office Outlook Security Feature Bypass Vulnerability
Microsoft Office Outlook contains a security feature bypass vulnerability due to improperly handling objects in memory. Successful exploitation allows an attacker to execute commands.
Apply updates per vendor instructions.
Risk Analysis
Microsoft Office Outlook has a security feature bypass vulnerability due to how it handles objects in memory, which can allow an attacker to execute commands. The high EPSS score of 0.82853 indicates a significant likelihood of exploitation. This vulnerability is confirmed to be actively exploited, as it is in CISA's KEV.
This vulnerability has been actively exploited in the wild. Exploitation likely occurs through specially crafted files or emails that are processed by Outlook.
Ensure Microsoft Office Outlook is fully updated with the latest security patches. Educate users on the risks of opening suspicious attachments or clicking malicious links.
Technical Analysis
CVE-2017-11774 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-2017-11774 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-2017-11774 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