Risk Letters

Exploited vulnerability

CVE-2009-0556

TLP:CLEAR

Microsoft Office PowerPoint Code Injection Vulnerability

Microsoft Office PowerPoint contains a code injection vulnerability that allows remote attackers to execute arbitrary code via a PowerPoint file with an OutlineTextRefAtom containing an invalid index value that triggers memory corruption.

Facts

  • Vendor: Microsoft
  • Product: Office
  • CVSS: 8.8
  • EPSS (probability of exploitation within 30 days): 67.3 %
  • On CISA's Known Exploited Vulnerabilities list since: 7 January 2026
  • First known exploitation: 7 January 2026
  • CISA's deadline for US federal agencies: 28 January 2026
  • Weakness: CWE-94
  • First seen by Risk Letters: 7 January 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD