Security readout for executives and security teams
Plain-English summary
OPNsense 19.1 has a reflected cross-site scripting issue in the traceroute diagnostics page. An unauthenticated attacker could cause JavaScript to run in a user’s browser if that user interacts with a crafted request. Business risk is mainly session abuse or misleading actions in the management UI, not direct firewall compromise by itself.
Executive priority
Treat as a near-term maintenance and exposure-reduction item. Prioritize faster if any OPNsense 19.1 management interface is reachable from the internet or broad internal networks. It is not presented as actively exploited in the provided sources.
Technical view
CVE-2019-25372 is CWE-79 in OPNsense 19.1 diag_traceroute.php. The host parameter lacks sufficient input validation, enabling reflected XSS via POST. CVSS 3.1 is 6.1: network-reachable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is likely limited to OPNsense 19.1 systems where the web management interface is reachable by potential attackers or targeted users. Internet-exposed administration portals increase risk. Later or supported versions may not be affected, but confirm against vendor guidance.
Exploitation context
A public ExploitDB reference exists, so proof-of-concept information is public. The provided data does not show CISA KEV listing or confirmed active exploitation. Successful exploitation requires user interaction and execution in the victim browser context.
Researcher notes
Evidence identifies reflected XSS in the host parameter of diag_traceroute.php for OPNsense 19.1. The release announcement for 19.1.1 is listed as a patch reference, but validate exact remediation details with OPNsense sources before closing findings.
Mitigation direction
- Identify any OPNsense 19.1 installations.
- Review the OPNsense 19.1.1 release announcement and vendor guidance.
- Upgrade affected systems according to OPNsense-supported update guidance.
- Restrict management interface access to trusted administrative networks.
- Educate administrators not to interact with unexpected diagnostic-page requests.
Validation and detection
- Confirm the installed OPNsense version on each firewall.
- Verify whether diag_traceroute.php is reachable from untrusted networks.
- Check whether management access is limited by network controls.
- Review web logs for suspicious traceroute diagnostic requests.
- After updating, confirm the system no longer reports version 19.1.
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-2019-25372 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/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_traceroute.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.