CVE-2009-0563
Published: June 8, 2022
Official Description
Microsoft Office contains a buffer overflow vulnerability that allows remote attackers to execute code via a Word document with a crafted tag containing an invalid length field.
CISA KEV Advisory
Microsoft Office Buffer Overflow Vulnerability
Microsoft Office contains a buffer overflow vulnerability that allows remote attackers to execute code via a Word document with a crafted tag containing an invalid length field.
Apply updates per vendor instructions.
Risk Analysis
This Microsoft Office vulnerability involves a buffer overflow that can be triggered by a specially crafted Word document, allowing remote code execution. With an EPSS score of 0.82519, there is a very high likelihood of exploitation, and its inclusion in CISA's KEV catalog confirms it has been actively exploited.
Active exploitation of this vulnerability has been observed in the wild, posing a significant risk to users opening malicious Word documents. It is remotely exploitable.
Apply the latest security updates for Microsoft Office to patch this buffer overflow vulnerability. Exercise caution when opening untrusted Word documents.
Technical Analysis
CVE-2009-0563 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-2009-0563 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-2009-0563 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