Vulnerability · Published Dec 23, 2025 · Assigned by zdi

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

Medium 4.5

In plain English

A medium-severity path traversal in OPNsense from Deciso. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).

Severity (CVSS 3.0)4.5Medium

Exploit odds (30 days)0.6%top 50.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Deciso	OPNsense	25.7

Weakness: CWE-22 · Vector: CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

References

ZDI-25-1022 x_research-advisory
vendor-provided URL vendor-advisory