Login Request a demo
Medium severity · published Nov 6, 2025
CVE-2025-34237
Advantech WebAccess/VPN versions prior to 1.1.5 contain a stored cross-site scripting (XSS) vulnerability via StandaloneVpnClientsController.addStandaloneVpnClientAction()
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
Advantech WebAccess/VPN versions prior to 1.1.5 contain a stored cross-site scripting (XSS) vulnerability via StandaloneVpnClientsController.addStandaloneVpnClientAction(). Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
Webaccess/vpn · Advantech
before 1.1.5 · source: NVD
Affected product
WE
Webaccess/vpn
Advantech
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-34237
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-34237
Product
https://icr.advantech.com/download/software
Release Notes
https://icr.advantech.com/support/router-models/download/511/sa-2025-01-vpn-portal-2025-11-06.pdf
Third Party Advisory
https://www.vulncheck.com/advisories/advantech-webaccess-vpn-stored-xss-via-standalonevpnclientscontroller
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