CVE-2009-0563KEV · OVERDUE

Microsoft Office Buffer Overflow Vulnerability

High · published June 10, 2009

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 7.8. It is confirmed in active exploitation. It sits in the 99.1th percentile for exploit probability.

1584
days past CISA
deadline
CVSS v3.1
7.8
EPSS
60%
Percentile
99.1
In the wild
Confirmed
What it is

🚨 Watch out! A stack-based buffer overflow in Microsoft Word could let an attacker execute arbitrary code just by opening a malicious document! 🔥 Think of it like an oversized package at a sorting facility—if the box is too big for the conveyor belt, it can cause a jam that lets things spill out everywhere. In this case, the malicious tag in the Word document can overflow and execute unexpected code as if it were on the production line. If exploited, this vulnerability allows attackers to take control of your system, potentially stealing sensitive data, deploying malware, or even wiping your files! Just opening a crafted document could lead to absolute chaos on your machine.

Put simply

Think of it like an oversized package at a sorting facility—if the box is too big for the conveyor belt, it can cause a jam that lets things spill out everywhere. In this case, the malicious tag in the Word document can overflow and execute unexpected code as if it were on the production line. This vulnerability occurs due to an invalid length field in a crafted tag, causing a stack-based buffer overflow when the document is processed, which could lead to the execution of arbitrary code.

What to do

If exploited, this vulnerability allows attackers to take control of your system, potentially stealing sensitive data, deploying malware, or even wiping your files! Just opening a crafted document could lead to absolute chaos on your machine. To protect yourself, immediately update Microsoft Word to the latest available version, ensuring you've applied all security patches. Educate users not to open unknown attachments, as this is a common attack vector. You've got this! Stay vigilant, follow these steps, and keep your systems secure! 🛡️

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.59634 · 99.1th percentile
Published
2009-06-10T17:37Z
KEV added
2022-06-08 · due 2022-06-22
EPSS history
Timeline
  • 08 JUN 00:00Z
    Added to CISA KEV — remediate by Jun 22
    kev
  • 10 JUN 17:37Z
    Stack-based buffer overflow in Microsoft Office Word 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Microsoft Office for Mac 2004 and 2008; Open XML File Format…
    cvelistv5