CVE-2025-34256: Advantech WISE-DeviceOn Server versions prior to 5.4 contain a hard-coded cryptographic key vulnerability

Q: How do I fix CVE-2025-34256?

wise-deviceon server: upgrade to 5.4. Exact commands for each OS are on this page.

Q: Is CVE-2025-34256 being exploited?

CVE-2025-34256 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-34256 affect?

CVE-2025-34256 affects wise-deviceon server. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2025-34256?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-34256 is a critical-severity flaw (CVSS 9.8) affecting wise-deviceon server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 perm

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-321
Published	2025-12-05
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: advantech

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-05 18:15 UTCPublished CVE record published
2026-06-17 09:13 UTCUpdated Record last modified

advantech wise-deviceon server UPGRADE

Affected: < 5.4

Fixed in: 5.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy wise-deviceon-server || rpm -q wise-deviceon-server || wise-deviceon-server --version

2. UPGRADE to 5.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wise-deviceon-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wise-deviceon-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-34256?

wise-deviceon server: upgrade to 5.4. Exact commands for each OS are on this page.

Is CVE-2025-34256 being exploited?

CVE-2025-34256 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-34256 affect?

CVE-2025-34256 affects wise-deviceon server. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2025-34256?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Advantech vulnerabilities

Related CVEs

CVE-2025-34259 MEDIUM 5.4 UPGRADE Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability
CVE-2025-34260 MEDIUM 5.4 UPGRADE Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability
CVE-2025-34261 MEDIUM 5.4 UPGRADE Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability
CVE-2025-34258 MEDIUM 5.4 UPGRADE Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability
CVE-2025-34262 MEDIUM 5.4 UPGRADE Advantech WISE-DeviceOn Server versions prior to 5.4 contain a stored cross-site scripting (XSS) vulnerability

References

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