XSS in Smoothwall Express
CVE-2019-25378
Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains multiple cross-site scripting vulnerabilities in the proxy.cgi endpoint that allow attackers to inject malicious scripts through parameters including CACHE_SIZE, MAX_SIZE, MIN_SIZE, MAX_OUTGOING_SIZE, and MAX_INCOMING_SIZE. Attackers can submit POST requests with script payloads to store or reflect arbitrary JavaScript code that executes in users' browsers when the proxy configuration page is accessed.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (12.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Smoothwall Express — versions 3.1
- Smoothwall Express — versions 3.1
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/46333 (Exploit, VDB Entry, Third Party Advisory, exploit)
- www.smoothwall.org (Product, product)
- www.vulncheck.com/advisories/smoothwall-express-proxycgi-cross-site-scripting (Broken Link, third-party-advisory)
Frequently asked questions
- What is CVE-2019-25378?
- CVE-2019-25378 is a medium-severity vulnerability in Smoothwall Express, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-02-16.
- How severe is CVE-2019-25378?
- Medium severity. CVSS v3 base score is 6.1 out of 10.