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CVE-2009-0558

38
FAUCET Score

CVE-2009-0558 describes an array index error in Microsoft Excel, affecting Office 2000 SP3, Office 2004/2008 for Mac, and the Open XML File Format Converter for Mac. This critical vulnerability (CVSS 9.3) allows remote attackers to execute arbitrary code by tricking users into opening a specially crafted Excel file containing a malformed record object. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the high CVSS score and FAUCET Risk Score of 97/100 indicate a severe potential impact if exploited.

Impacted Technologies

VendorProductVersion(s)CPE
2004CPE matchmatch criteria
cpe:2.3:a:microsoft:office:2004:*:mac:*:*:*:*:*
2008CPE matchmatch criteria
cpe:2.3:a:microsoft:office:2008:*:mac:*:*:*:*:*
xpCPE matchmatch criteria
cpe:2.3:a:microsoft:office:xp:sp3:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:microsoft:office_compatibility_pack_for_word_excel_ppt_2007:*:sp1:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:microsoft:office_compatibility_pack_for_word_excel_ppt_2007:*:sp2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

9.3HIGH

AV:N/AC:M/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
31.07%
Probability of exploitation in next 30 days
EPSS Percentile
98.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.3107 is in the 94th percentile among its peer group of 8,914 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

osvdb.org / 54954
docs.microsoft.com / en-us/security-updates/securitybulletins/2009/ms09-021
secunia.com / secunia_research/2009-1
Vendor Advisory
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11525
securityfocus.com / archive/1/504188/100/0/threaded
securityfocus.com / bid/35242
securitytracker.com / id
us-cert.gov / cas/techalerts/TA09-160A.html
US Government Resource
vupen.com / english/advisories/2009/1540