What’s Vulnerable › Vulnerabilities

CVE-2025-13698: Deciso OPNsense diag_backup.php filename Directory Traversal Arbitrary File Creation Vulnerability

• Severity: medium (CVSS 4.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-23 · updated 2026-10-19
• Weakness: CWE-22

Description

Deciso OPNsense diag_backup.php filename Directory Traversal Arbitrary File Creation Vulnerability. This vulnerability allows network-adjacent attackers to create arbitrary files on affected installations of Deciso OPNsense. Authentication is required to exploit this vulnerability. The specific flaw exists within the handling of backup configuration files. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to create files in the context of root. Was ZDI-CAN-28133.

Affected products

• Deciso OPNsense: 25.7

References

• https://github.com/opnsense/core/commit/cb15c935137d05c86a1e6cf12af877e9c32a23af
• https://www.zerodayinitiative.com/advisories/ZDI-25-1022/

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