CVE-2025-34256: Advantech Co., Ltd. WISE-DeviceOn Server

Advantech WISE-DeviceOn Server < 5.4 Hard-coded JWT Key Authentication Bypass

CVSS 10.0 CriticalCriticalEPSS 0.0074 · 55th percentile

Critical, because:

CVSS score 10.0: 9.0 or more.

Published by the CVE Program (CNA: VulnCheck) at 5 Dec 2025, 17:18 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Advantech Co., Ltd.	WISE-DeviceOn Server	affected before 5.4.0 semver Other versions: unaffected

Identifiers

CVE-2025-34256

CNA

VulnCheck

Weakness (CWE)

CWE-321

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
10.0	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0074, the 55th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 5 Dec 2025. New records show when each source confirmed them.

Sources

References from the CNA

advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4537a95d19/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----DeviceOn-20251208-2.pdf vendor-advisorypatch
docs.deviceon.advantech.com/docs/resource/ product
www.vulncheck.com/advisories/advantech-wise-deviceon-server-hardcoded-jwt-key-authentication-bypass third-party-advisory
pellera.com/blog/advantech-wise-deviceon-cve-2025-34256-vulnerability/ technical-descriptionexploit

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.