CVE-2017-0261
Published: March 3, 2022
Official Description
Microsoft Office contains a use-after-free vulnerability which can allow for remote code execution.
CISA KEV Advisory
Microsoft Office Use-After-Free Vulnerability
Microsoft Office contains a use-after-free vulnerability which can allow for remote code execution.
Apply updates per vendor instructions.
Risk Analysis
Microsoft Office contains a use-after-free vulnerability that can lead to remote code execution. This flaw allows an attacker to execute arbitrary code on a vulnerable system. The high EPSS score of 0.92942 indicates a very high likelihood of exploitation, making this a critical vulnerability for Microsoft Office users.
This vulnerability has been actively exploited in the wild and is included in CISA's KEV catalog, confirming its use by threat actors. The remote nature of the exploit makes it a serious threat.
Users should apply the latest security updates for Microsoft Office to mitigate this vulnerability. Employing robust email and document security practices, such as not opening untrusted attachments, is also crucial.
Technical Analysis
CVE-2017-0261 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-2017-0261 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-2017-0261 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