Is CVE-2025-34256 in the CISA KEV catalog?

No. CVE-2025-34256 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-34256?

CVE-2025-34256 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2025-34256?

CVE-2025-34256 has an EPSS score of 0.60% (45th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-34256?

Upgrade wise-deviceon server to 5.4 or later.

CVE & CISA-KEV Catalog

CVE-2025-34256

CRITICAL

9.8

CVSS v3

NVD

Description

Advantech WISE-DeviceOn Server versions prior to 5.4 contain a hard-coded cryptographic key vulnerability. The product uses a static HS512 HMAC secret for signing EIRMMToken JWTs across all installations. The server accepts forged JWTs that need only contain a valid email claim, allowing a remote unauthenticated attacker to generate arbitrary tokens and impersonate any DeviceOn account, including the root super admin. Successful exploitation permits full administrative control of the DeviceOn instance and can be leveraged to execute code on managed agents through DeviceOn’s remote management features.

CWE-321

How to fix

Remediation Available

wise-deviceon serverNVD

Affected:< 5.4Fixed in:5.4CVE-2025-34256derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.60%probability of exploitation in 30 days

45thpercentile

Moderate risk: more likely to be exploited than 45% of all known CVEs.

References

Third-Party Advisory1

vulncheck.com

Product1

docs.deviceon.advantech.com

Other references2

Related Vulnerabilities

Other CWE-321 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-30406	Critical	9.0	94%	KEV	Fix
CVE-2016-4437	Critical	9.8	93%	KEV	Fix
CVE-2023-32169	Critical	9.8	56%	-	-
CVE-2023-27584	Critical	9.8	34%	-	Fix
CVE-2020-10884	High	8.8	25%	-	-
CVE-2021-4228	Medium	5.8	9.9%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-15.