What is CVE-2011-0104?

CVE-2011-0104 is a vulnerability in Microsoft Excel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-04-13.

Is CVE-2011-0104 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Microsoft Excel

CVE-2011-0104

Microsoft Excel 2002 SP3 and 2003 SP3, Office 2004 and 2008 for Mac, and Open XML File Format Converter for Mac allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted HLink record in an Excel file, aka "Excel Buffer Overwrite Vulnerability."

Vulnerability class: Buffer Overflow

Published 2011-04-13 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 9.3 (High). Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.534 (99.0th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.534 · newest: 0.534 · change: 0.000

Affected products

Microsoft Excel — versions 2002, 2003
Microsoft Office — versions 2004, 2008
Microsoft Open XML File Format Converter

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:11767 (signature, vdb-entry)
www.us-cert.gov/cas/techalerts/TA11-102A.html (US Government Resource, third-party-advisory)
secunia.com/advisories/39122 (Vendor Advisory, third-party-advisory)
osvdb.org/71761 (vdb-entry)
www.checkpoint.com/defense/advisories/public/2011/cpai-31-Mard.html
www.securitytracker.com/id (vdb-entry)
www.securityfocus.com/bid/47245 (vdb-entry)
docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-021 (vendor-advisory)
www.vupen.com/english/advisories/2011/0940 (vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2011-0104?: CVE-2011-0104 is a vulnerability in Microsoft Excel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2011-04-13.
Is CVE-2011-0104 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.