What’s Vulnerable › Vulnerabilities

CVE-2025-64403: Apache OpenOffice: Remote documents loaded without prompt via "external data sources" in Calc

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-12 · updated 2026-10-18
• Weakness: CWE-862

Description

Apache OpenOffice Calc spreadsheet can contain links to other files, in the form of "external data sources". A missing Authorization vulnerability in Apache OpenOffice allowed an attacker to craft a document that would cause such links to be loaded without prompt. This issue affects Apache OpenOffice: through 4.1.15. Users are recommended to upgrade to version 4.1.16, which fixes the issue.

Affected products

• Apache Software Foundation Apache OpenOffice: before 4.1.16 — fixed in 4.1.16

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache OpenOffice 4.1.16. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/t7c6jhvdb00xtgd9vvn7h5sq9f4h5trt
• https://www.openoffice.org/security/cves/CVE-2025-64403.html
• http://www.openwall.com/lists/oss-security/2025/11/11/6

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