CVE-2009-0556KEV · OVERDUE

Microsoft Office PowerPoint Code Injection Vulnerability

High · published April 3, 2009

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 99.3th percentile for exploit probability.

268
days past CISA
deadline
CVSS v3.1
8.8
EPSS
67%
Percentile
99.3
In the wild
Confirmed
What it is

🚨 An invalid index value in PowerPoint files could let attackers run arbitrary code — and this vulnerability has already been exploited in the wild! ⚡ Think of it like a movie theater screening the wrong film because someone tampered with the projector settings — not only is the audience confused, but malicious actors could hijack the show entirely! An attacker could craft a cleverly disguised PowerPoint presentation that, once opened, executes harmful code on the victim's system, potentially leading to data breaches or complete system compromise. This could be absolutely devastating for any organization, especially if sensitive information is at stake!

Put simply

Think of it like a movie theater screening the wrong film because someone tampered with the projector settings — not only is the audience confused, but malicious actors could hijack the show entirely! This memory corruption vulnerability occurs due to an improperly handled OutlineTextRefAtom in PowerPoint files, allowing attackers to manipulate memory and run arbitrary code remotely without needing user authentication.

What to do

An attacker could craft a cleverly disguised PowerPoint presentation that, once opened, executes harmful code on the victim's system, potentially leading to data breaches or complete system compromise. This could be absolutely devastating for any organization, especially if sensitive information is at stake! To safeguard against this threat, ensure that you update Microsoft Office to the latest version available, ideally beyond the SP3 versions mentioned. It's also crucial to educate users about the dangers of opening untrusted PowerPoint files. You've got this! Stay vigilant, patch up, and keep your systems secure! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.67312 · 99.3th percentile
Published
2009-04-03T18:00Z
KEV added
2026-01-07 · due 2026-01-28
EPSS history
Timeline
  • 07 JAN 00:00Z
    Added to CISA KEV — remediate by Jan 28
    kev
  • 03 APR 18:00Z
    Microsoft Office PowerPoint 2000 SP3, 2002 SP3, and 2003 SP3, and PowerPoint in Microsoft Office 2004 for Mac, allows remote attackers to execute arbitrary…
    cvelistv5