High severity · published Nov 12, 2025
CVE-2025-64403
Apache OpenOffice: Remote documents loaded without prompt via "external data sources" in Calc
8.1
CVSS
1.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 69% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AO
Apache OpenOffice · Apache Software Foundation
through 4.1.15 · source: vendor
OP
Openoffice · Apache
before 4.1.16 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-64403
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-64403
Mailing List
https://lists.apache.org/thread/t7c6jhvdb00xtgd9vvn7h5sq9f4h5trt
Vendor Advisory
https://www.openoffice.org/security/cves/CVE-2025-64403.html
Mailing List
http://www.openwall.com/lists/oss-security/2025/11/11/6
More from Apache OpenOffice
8.8
CVE-2026-59265
Apache OpenOffice, Apache OpenOffice: Opening a malicious document can lead to system takeover
7.8
CVE-2018-11790
When loading a document with Apache Open Office 4.1.5 and earlier with smaller end line termination than the operating system uses, the defect occurs
7.5
CVE-2025-64405
Apache OpenOffice: Remote documents loaded without prompt via DDE function
7.5
CVE-2025-64404
Apache OpenOffice: Remote documents loaded without prompt via background and bullet images
7.5
CVE-2025-64401
Apache OpenOffice: Remote documents loaded without prompt via IFrame