CVE-2013-1331
HighExploitedPublic exploitBuffer overflow in Microsoft Office 2003 SP3 and Office 2011 for Mac allows remote attackers to execute arbitrary code via crafted PNG data in an Office document, leading to improper memory allocation, aka "Office Buffer Overflow Vulnerability."
Published Jun 12, 2013 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2013-1331 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Office (Microsoft).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 1, 2016. Public exploit code is available.
- EPSS estimates a 80% 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.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
80%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2013-1331 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Buffer overflow in Microsoft Office 2003 SP3 and Office 2011 for Mac allows remote attackers to execute arbitrary code via crafted PNG data in an Office document, leading to improper memory allocation, aka "Office Buffer Overflow Vulnerability."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jun 8, 2022 | Jun 22, 2022 | Not reported |
| Industry KEV feed | Apr 1, 2016 | Jun 22, 2022 | Not reported |
| CIRCL KEV | Jun 8, 2022 | Jun 22, 2022 | Not reported |
| ENISA EUVD | Jun 8, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| OfficeMicrosoft | 2003-sp3, 2011 | n/a |
Timeline
Publicly disclosed
Jun 12, 2013
Added to Industry KEV feed
Apr 1, 2016
Added to CISA KEV
Jun 8, 2022
Added to CIRCL KEV
Jun 8, 2022
Added to ENISA EUVD
Jun 8, 2022
Last updated
Apr 22, 2026
Weakness Type
- CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
References
- advisoryTA13-168A
- patchMS13-051
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Buffer overflow in Microsoft Office 2003 SP3 and Office 2011 for Mac allows remote attackers to execute arbitrary code via crafted PNG data in an Office document, leading to improper memory allocation, aka "Office Buffer Overflow Vulnerability."
Affected: Office (Microsoft) versions 2003-sp3, 2011. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 1, 2016.
Yes. It was added on Jun 8, 2022 with a federal remediation due date of Jun 22, 2022.
Public exploit code is available.
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-2013-1331 Running On Your Attack Surface?
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