CVE-2009-1134Office Code Injection
Excel in 2007 Microsoft Office System SP1 and SP2; 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 BIFF file with a malformed Qsir (0x806)…
Published Jun 10, 2009 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2009-1134 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Office (Microsoft), Office Compatibility Pack For Word Excel Ppt 2007 (Microsoft), Office Excel (Microsoft) and 3 more products.
- It is exploited in the wild, listed in Industry KEV feed since Oct 18, 2012. No public exploit code is known.
- EPSS estimates a 36% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v2
9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
36%
Higher than 98.4% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
49/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Oct 18, 2012
1226 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Description
Excel in 2007 Microsoft Office System SP1 and SP2; 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 BIFF file with a malformed Qsir (0x806) record object, aka "Record Pointer Corruption Vulnerability."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 18, 2012 | n/a | Not reported |
Affected Products
16 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| OfficeMicrosoft | 2004, 2008, xp-sp3 | n/a |
| Office Compatibility Pack For Word Excel Ppt 2007Microsoft | See advisory | n/a |
| Office ExcelMicrosoft | 2000-sp3, 2003-sp3, 2007-sp1, 2007-sp2 | n/a |
| Office Excel ViewerMicrosoft | 2003-sp3 | n/a |
| Office Sharepoint ServerMicrosoft | 2007-sp1, 2007-sp2 | n/a |
Timeline
Publicly disclosed
Jun 10, 2009
Added to Industry KEV feed
Oct 18, 2012
Last updated
Apr 22, 2026
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- exploitVulnCheck exploitation report
- other54958
- otherMS09-021
- otheroval:org.mitre.oval:def:5922
- other20090610 ZDI-09-040: Microsoft Office Excel QSIR Record Pointer Corruption Vulnerability
FAQ
Common Questions.
Excel in 2007 Microsoft Office System SP1 and SP2; 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 BIFF file with a malformed Qsir (0x806) record object, aka "Record Pointer Corru…
Affected: Office (Microsoft) versions 2004, 2008, xp-sp3; Office Compatibility Pack For Word Excel Ppt 2007 (Microsoft); Office Excel (Microsoft) versions 2000-sp3, 2003-sp3, 2007-sp1, 2007-sp2, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Oct 18, 2012.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2009-1134 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
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