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Vulnerability record · CVE-2023-39004 · published 9 August 2023

CVE-2023-39004: Opnsense incorrect permission assignment vulnerability

Opnsense · Opnsense

Insecure permissions in the configuration directory (/conf/) of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allow attackers to access sensitive information (e.g., hashed root password) which could lead to privilege escalation.

9.8 CVSS 3.1 Critical EPSS 0.99% · top 39.1% CWE-732 · Incorrect permission assignment
9.8CVSS 3.1 base score
0.99%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
9 Jul 2026Last modified by NVD

Description

Insecure permissions in the configuration directory (/conf/) of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allow attackers to access sensitive information (e.g., hashed root password) which could lead to privilege escalation.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://logicaltrust.net/blog/2023/08/opnsense.html ExploitThird Party Advisory
https://logicaltrust.net/blog/2023/08/opnsense.html ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-27152Opnsense improper restriction of authentication attempts vulnerabilityDECISO OPNsense 23.1 does not impose rate limits for authentication, allowing attackers to perform a brute-force attack to bypass authentication.EPSS 0.89%9.8CVE-2023-39008Opnsense command injection vulnerabilityA command injection vulnerability in the component /api/cron/settings/setJob/ of OPNsense Community Edition before 23.7 and Business Edition before 2…EPSS 3.1%9.8CVE-2023-39001Opnsense command injection vulnerabilityA command injection vulnerability in the component diag_backup.php of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allow…EPSS 3.6%9.6CVE-2023-39007Opnsense cross-site scripting vulnerability/ui/cron/item/open in the Cron component of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows XSS via openAction in ap…EPSS 2.6%9.1CVE-2026-45158Opnsense argument injection vulnerabilityOPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, unsanitized user input is passed to the DHCP configuration of the configu…EPSS 0.82%9.1CVE-2026-44193Opnsense argument injection vulnerabilityOPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, the XMLRPC method opnsense.restore_config_section fails to sanitize user …EPSS 0.86%9.1CVE-2026-44194Opnsense os command injection vulnerabilityOPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, an authenticated Remote Code Execution (RCE) vulnerability in the OPNsens…EPSS 0.82%9.1CVE-2025-50989Opnsense os command injection vulnerabilityOPNsense before 25.1.8 contains an authenticated command injection vulnerability in its Bridge Interface Edit endpoint (interfaces_bridge_edit.php). …EPSS 8.4%

Source: NIST National Vulnerability Database (record CVE-2023-39004), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.