Security readout for executives and security teams
Plain-English summary
OPNsense 19.1 has a stored cross-site scripting issue in firewall rule editing. An authenticated user can save malicious script content that runs in another user’s browser when firewall rule pages are viewed. This can expose session-related data or alter actions in the web interface, but sources do not indicate system-level compromise.
Executive priority
Treat as a medium-priority remediation unless OPNsense 19.1 management access is broadly exposed or shared with semi-trusted users. Prioritize upgrade or isolation of any affected firewall management interface because compromise of administrator browser sessions can undermine firewall administration.
Technical view
CVE-2019-25373 is CWE-79 stored XSS in OPNsense 19.1, affecting firewall_rules_edit.php through the category parameter. CVSS 3.1 is 6.4, requiring low privileges and network access to the management interface. The source bundle lists ExploitDB and VulnCheck references and an OPNsense 19.1.1 release announcement as patch-related material.
Likely exposure
Exposure is likely limited to organizations running OPNsense 19.1 where the administrative web interface is reachable by untrusted or lower-privileged authenticated users. Internet-exposed management interfaces increase risk. Later or supported OPNsense versions are not identified as affected in the provided sources.
Exploitation context
A public ExploitDB reference exists, so proof-of-concept information appears publicly available. CISA KEV is false in the provided data, and no cited source states active exploitation. Exploitation requires authenticated access and impacts users who later view affected firewall rule pages.
Researcher notes
The provided data supports OPNsense 19.1 as affected and identifies stored XSS in the category parameter. Patch details are referenced through the OPNsense 19.1.1 announcement, but the source bundle does not provide detailed fix text. Do not infer impact beyond browser-side JavaScript execution in the administrative context.
Mitigation direction
- Identify and retire any OPNsense 19.1 installations.
- Review the OPNsense 19.1.1 release announcement and vendor guidance for the relevant fix.
- Upgrade to a vendor-supported OPNsense release where feasible.
- Restrict administrative interface access to trusted networks and administrators.
- Review accounts with access to firewall rule management.
Validation and detection
- Inventory OPNsense versions across firewalls and virtual appliances.
- Confirm whether any system still runs OPNsense 19.1.
- Check whether the web admin interface is reachable from untrusted networks.
- Review firewall rule categories for unexpected script-like content.
- Review admin audit logs for unusual firewall rule edits.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2019-25373 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-46351CVE reference · exploit
- OPNsense Official WebsiteCVE reference · product
- OPNsense 19.1.1 Release AnnouncementCVE reference · patch
- VulnCheck Advisory: OPNsense 19.1 Stored XSS via firewall_rules_edit.phpCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.