Security readout for executives and security teams
Plain-English summary
This issue affects OPNsense 19.1 firewall administration pages. A logged-in attacker could trick an administrator into submitting crafted backup-settings data, causing script execution inside the administrator’s browser session. Business impact is mainly compromise of administrative trust and possible configuration exposure or unauthorized changes, not direct remote takeover without authentication and user interaction.
Executive priority
Treat as a near-term hygiene item for firewall management security, especially if OPNsense 19.1 remains in use. It is not described as actively exploited, but public exploit information and firewall administrative context justify prompt validation and update planning.
Technical view
CVE-2019-25368 is a reflected cross-site scripting issue in OPNsense 19.1 diag_backup.php. Multiple backup integration parameters are reported as injectable, including Google Drive and Nextcloud fields. CVSS 3.1 is 5.4: network reachable, low complexity, low privileges required, user interaction required, changed scope, low confidentiality and integrity impact.
Likely exposure
Exposure is limited to environments running OPNsense 19.1 where the administrative interface is reachable by users who can authenticate or influence an authenticated administrator. Internet-exposed management interfaces increase risk, but the sources do not state broad active exploitation.
Exploitation context
A public Exploit-DB entry and VulnCheck advisory exist, indicating public technical knowledge. The CVE is not marked KEV in the provided bundle. Exploitation requires authentication and administrator interaction, so phishing, malicious internal users, or compromised low-privilege accounts are the most plausible paths.
Researcher notes
Evidence identifies reflected XSS across several diag_backup.php POST parameters in OPNsense 19.1. Public exploit reference exists, but do not infer real-world exploitation from that alone. Patch specifics are only represented by the OPNsense 19.1.1 release reference in the provided bundle; confirm exact fixed builds from vendor materials.
Mitigation direction
- Identify any OPNsense 19.1 systems and prioritize administrative interface review.
- Apply vendor guidance and relevant OPNsense updates, including reviewing the 19.1.1 release announcement.
- Restrict management interface access to trusted administrative networks or VPNs.
- Limit administrator sessions and avoid opening untrusted links while authenticated.
- Review firewall admin accounts for unnecessary or stale access.
Validation and detection
- Confirm OPNsense version on all managed firewall appliances.
- Check whether diag_backup.php is accessible on management interfaces.
- Review access controls limiting administrative UI exposure.
- Inspect administrative logs for unusual backup configuration changes.
- Verify applied updates against OPNsense release guidance.
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-2019-25368 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
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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:R/S:C/C:L/I:L/A:N2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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 Reflected XSS via diag_backup.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.