CVE-2026-14837

Administrative access via SSH activation signature bypass

Published Jul 27, 2026 · Updated Jul 27, 2026

Improper signature verification in Lenze c430, c520, c550, and i950 firmware allows local users to gain administrative access. The SSH enablement routine accepts a crafted activation file from the SD card after its cryptographic signature verification is bypassed. Low-privileged access sufficient to place the file on the device enables SSH and can result in complete system compromise.

CVSS severity8.5
High
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in Lenze c430, c520, c550, and i950 firmware allows local users to gain administrative access. The SSH enablement routine accepts a crafted activation file from the SD card after its cryptographic signature verification is bypassed. Low-privileged access sufficient to place the file on the device enables SSH and can result in complete system compromise.

The record

CVE
CVE-2026-14837
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Lenze
Product
c430 controller
Classifications
CWE-347, T1548
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <1.15.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Lenze · c430 controllerversion=1.0.0 <1.15.2
Lenze · c520 controllerversion=1.0.0 <1.15.2
Lenze · i950 cabinet servo drive (Gen A)version=1.0.0 <1.14.2
Lenze · c550 controllerversion=1.0.0 <1.15.2
Lenze · i950 cabinet servo drive (Gen B)version=2.0.0 <2.0.3

Published CVSS scores

8.5CERT@VDECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8CERT@VDECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1548Abuse Elevation Control Mechanism

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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