Is CVE-2009-3129 actively exploited?

Yes. CVE-2009-3129 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2009-3129 be exploited remotely?

The attack vector of CVE-2009-3129 has not been classified yet.

What is the CVSS score of CVE-2009-3129?

CVE-2009-3129 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2009-3129

HIGHCISA KEVIN THE WILD

CVE-2009-3129

Published: March 3, 2022

EPSS:91.08%probability of exploitation in 30 daysPercentile:99.6th

Official Description

Microsoft Office Excel allows remote attackers to execute arbitrary code via a spreadsheet with a FEATHEADER record containing an invalid cbHdrData size element that affects a pointer offset.

NVD Source

CISA KEV Advisory

Microsoft Excel Featheader Record Memory Corruption Vulnerability

Microsoft Office Excel allows remote attackers to execute arbitrary code via a spreadsheet with a FEATHEADER record containing an invalid cbHdrData size element that affects a pointer offset.

Added to KEV: 2022-03-03Federal patch deadline: 2022-03-24

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

Microsoft Office Excel is vulnerable to remote code execution via a specially crafted spreadsheet. This high-severity flaw, stemming from an invalid size element in a FEATHEADER record, has a very high exploitation likelihood (EPSS 0.91083). It is in CISA's KEV, confirming active exploitation.

This vulnerability is actively exploited in the wild, allowing remote attackers to execute arbitrary code. This typically occurs when a user opens a malicious Excel file.

Recommended Action

Users should apply all available security updates for Microsoft Office Excel. Exercise caution when opening untrusted or suspicious Excel spreadsheets.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2009-3129 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2009-3129 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.