Oct 19, 2026 · 15:59 UTC SEARCH
UNRATED KNOWN EXPLOITED
Vulnerability intelligence

CVE-2009-0556

VendorMicrosoft
ProductOffice
Known exploitedYes
Added to CISA KEVJanuary 7, 2026
KEV due dateJanuary 28, 2026
Known ransomware useNot identified by CISA

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.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA KEV status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities Catalog. Known ransomware campaign use: Unknown.

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