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Exploited vulnerability · CISA KEV

Is CVE-2009-3129 exploited? Yes: in CISA KEV since 3 Mar 2022

Gociux · Microsoft Excel · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2009-3129, Microsoft Excel Featheader Record Memory Corruption Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Mar 2022, 4495 days after it was published. It affects Microsoft Excel. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity7.8CVSS 3.1 · high
US federal due24 Mar 2022BOD 22-01 deadline

What it is

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.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductExcel
VulnerabilityMicrosoft Excel Featheader Record Memory Corruption Vulnerability
WeaknessCWE-94
Published11 Nov 2009
Added to KEV3 Mar 2022
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for Excel in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 11 Nov 2009.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Excel

References

Questions

Is CVE-2009-3129 being exploited?

Yes. CISA added CVE-2009-3129 to the Known Exploited Vulnerabilities catalog on 3 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2009-3129 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2009-3129?

Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Excel and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2022 · Microsoft scorecard · act-now radar.

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