CVE-2010-3336Office Memory Corruption
Microsoft Office XP SP3, Office 2004 and 2008 for Mac, Office for Mac 2011, and Open XML File Format Converter for Mac allow remote attackers to execute arbitrary code via a crafted Office document that triggers memory corruption, aka "MSO Large SPID Read AV Vulnerability."
Published Nov 10, 2010 · Updated Apr 28, 2026
Key Facts
Patch immediately- CVE-2010-3336 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Office (Microsoft), Open XML File Format Converter (Microsoft).
- It is exploited in the wild, listed in Industry KEV feed since Aug 17, 2021. No public exploit code is known.
- EPSS estimates a 24% 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)
24%
Higher than 97.8% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
47/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Aug 17, 2021
3933 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
Microsoft Office XP SP3, Office 2004 and 2008 for Mac, Office for Mac 2011, and Open XML File Format Converter for Mac allow remote attackers to execute arbitrary code via a crafted Office document that triggers memory corruption, aka "MSO Large SPID Read AV Vulnerability."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Aug 17, 2021 | n/a | Not reported |
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| OfficeMicrosoft | 2004, 2008, 2011, xp-sp3 | n/a |
| Open XML File Format ConverterMicrosoft | See advisory | n/a |
Timeline
Publicly disclosed
Nov 10, 2010
Added to Industry KEV feed
Aug 17, 2021
Last updated
Apr 28, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- exploitVulnCheck exploitation report
- otherMS10-087
- other38521
- other42144
- otheroval:org.mitre.oval:def:11947
FAQ
Common Questions.
Microsoft Office XP SP3, Office 2004 and 2008 for Mac, Office for Mac 2011, and Open XML File Format Converter for Mac allow remote attackers to execute arbitrary code via a crafted Office document that triggers memory corruption, aka "MSO Large SPID Read AV Vulnerability."
Affected: Office (Microsoft) versions 2004, 2008, 2011, xp-sp3; Open XML File Format Converter (Microsoft). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Aug 17, 2021.
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-2010-3336 On Your Attack Surface?
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