How severe is CVE-2025-34237?

CVE-2025-34237 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-34237 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-34237?

CVE-2025-34237 affects Advantech Webaccess/vpn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-34237?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-34237 have an EU (EUVD) identifier?

Yes. CVE-2025-34237 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-38172.

When was CVE-2025-34237 published?

CVE-2025-34237 was published on 2025-11-06 and last updated on 2026-06-17.

CVE-2025-34237

CVE-2025-34237 is a medium-severity vulnerability in Advantech Webaccess/vpn with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 6.3
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-38172
Weakness: CWE-79
Affected product: Advantech Webaccess/vpn
Published: 2025-11-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-34237?: 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.
How severe is CVE-2025-34237?: CVE-2025-34237 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-34237 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-34237?: CVE-2025-34237 affects Advantech Webaccess/vpn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-34237?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-34237 have an EU (EUVD) identifier?: Yes. CVE-2025-34237 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-38172.
When was CVE-2025-34237 published?: CVE-2025-34237 was published on 2025-11-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:advantech:webaccess\/vpn:*:*:*:*:*:*:*:*

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