CVE-2009-0557Excel in Microsoft Office 2000 SP3, Office XP SP3, Office 2003 SP3, and Office 2004 and 2008 for Mac; Excel in 2007 Microsoft Office System SP1 and SP2; Open XML File Format Converter for Mac; Micros…
Updated under an hour ago ()
Does this affect you?
It affects microsoft office and 4 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jun 8, 2022; federal agencies had to remediate by Jun 22, 2022. Treat that date as your deadline.
Do this next
Free account, 1 product
Excel in Microsoft Office 2000 SP3, Office XP SP3, Office 2003 SP3, and Office 2004 and 2008 for Mac; Excel in 2007 Microsoft Office System SP1 and SP2; Open XML File Format Converter for Mac; Microsoft Office Excel Viewer 2003 SP3; Microsoft Office Excel Viewer; and Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allow remote attackers to execute arbitrary code via a crafted Excel file with a malformed record object, aka "Object Record Corruption Vulnerability."
- CVSS
- 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-94
- Known exploited
- Added to CISA KEV Jun 8, 2022; federal remediation due Jun 22, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 53.00% (percentile 99)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 22, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
microsoft office microsoft:office | 2000; 2003; 2004; 2007; 2007; 2008; xp | NVD |
microsoft office_compatibility_pack microsoft:office_compatibility_pack | 2007; 2007 | NVD |
microsoft office_excel_viewer microsoft:office_excel_viewer | all versions; 2003 | NVD |
microsoft office_sharepoint_server microsoft:office_sharepoint_server | 2007; 2007 | NVD |
microsoft open_xml_file_format_converter microsoft:open_xml_file_format_converter | all versions | NVD |
References
- http://www.vupen.com/english/advisories/2009/1540vdb-entry, x-refsource-vupen, broken-link
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5564vdb-entry, signature, x-refsource-oval, broken-link
- http://www.securitytracker.com/id?1022351vdb-entry, x-refsource-sectrack, broken-link, third-party-advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-021vendor-advisory, x-refsource-ms, patch
- http://osvdb.org/54953vdb-entry, x-refsource-osvdb, broken-link
- http://www.securityfocus.com/bid/35241vdb-entry, x-refsource-bid, broken-link, third-party-advisory
- http://www.us-cert.gov/cas/techalerts/TA09-160A.htmlthird-party-advisory, x-refsource-cert, broken-link, us-government-resource
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-0557us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.