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CVE-2019-25375— OPNsense 19.1 Reflected XSS via monit interface

Quick assessment

Affected
Opnsense OPNsense
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Deciso OPNsense是荷兰Deciso公司的一个防火墙与路由器操作系统。 Deciso OPNsense 19.1版本存在跨站脚本漏洞，该漏洞源于monit接口中mailserver参数输入验证不足，可能导致未经验证攻击者在用户浏览器中执行任意代码。

CVSS 6.1 · Medium EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Opnsense OPNsense 19.1 affected
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I. Basic Information for CVE-2019-25375

Vulnerability Information
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Vulnerability Title
OPNsense 19.1 Reflected XSS via monit interface
Source: CVE Program / CVE List V5
Vulnerability Description
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting crafted input to the mailserver parameter. Attackers can send POST requests to the monit interface with JavaScript payloads in the mailserver parameter to execute arbitrary code in users' browsers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Deciso OPNsense 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deciso OPNsense是荷兰Deciso公司的一个防火墙与路由器操作系统。 Deciso OPNsense 19.1版本存在跨站脚本漏洞，该漏洞源于monit接口中mailserver参数输入验证不足，可能导致未经验证攻击者在用户浏览器中执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Opnsense OPNsense 19.1 -

II. Public POCs for CVE-2019-25375

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III. Intelligence Information for CVE-2019-25375

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Exploits & Public PoCs for CVE-2019-25375 (1)

Same Patch Batch · Opnsense · 2026-02-15 · 10 CVEs total

CVE-2019-25373 6.4 MEDIUM OPNsense 19.1 Stored XSS via firewall_rules_edit.php
CVE-2019-25369 6.4 MEDIUM OPNsense 19.1 Stored XSS via system_advanced_sysctl.php
CVE-2019-25376 6.1 MEDIUM OPNsense 19.1 Reflected XSS via proxy endpoint
CVE-2019-25370 6.1 MEDIUM OPNsense 19.1 Reflected XSS via interfaces_vlan_edit.php
CVE-2019-25371 6.1 MEDIUM OPNsense 19.1 Reflected XSS via diag_ping.php
CVE-2019-25372 6.1 MEDIUM OPNsense 19.1 Reflected XSS via diag_traceroute.php
CVE-2019-25374 6.1 MEDIUM OPNsense 19.1 Reflected XSS via vpn_ipsec_settings.php
CVE-2019-25377 5.4 MEDIUM OPNsense 19.1 Reflected XSS via system_advanced_sysctl.php
CVE-2019-25368 5.4 MEDIUM OPNsense 19.1 Reflected XSS via diag_backup.php

IV. Related Vulnerabilities

Same product: OPNsense
Same vendor: Opnsense
Same weakness: CWE-79