c430: Improper Verification of Cryptographic Signature
CVE-2026-14837 is a high-severity improper verification of cryptographic signature vulnerability in c430 from Lenze, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists version 1.15.2 as the first without the flaw, so updating c430 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.11% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update c430 to 1.15.2 or a later version.
- Update c520 to 1.15.2 or a later version.
- Update c550 to 1.15.2 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Lenze | c430 | 1.0.0 up to, but not including, 1.15.2 | 1.15.2 |
| Lenze | c520 | 1.0.0 up to, but not including, 1.15.2 | 1.15.2 |
| Lenze | c550 | 1.0.0 up to, but not including, 1.15.2 | 1.15.2 |
| Lenze | i950 GenA | 1.0.0 up to, but not including, 1.14.2 | 1.14.2 |
| Lenze | i950 GenB | 2.0.0 up to, but not including, 2.0.3 | 2.0.3 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (cert.vde.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.5 | High | CNA (cert.vde.com) |
| CVSS 3.1 | 7.8 | High | CNA (cert.vde.com) |
Official description
Multiple Lenze products are affected by an improper signature verification vulnerability in the SSH enablement mechanism. A low-privileged local attacker can bypass verification of the SSH enable file signature and enable SSH access on the device. Successful exploitation may result in unauthorized administrative access and complete system compromise.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other references
Recent Improper Verification of Cryptographic Signature vulnerabilities
- 7.5 High severity
- 8.6 High severity
- 7.5 High severity
- 8.2 High severity
- 9.3 Critical severity
- 9.8 Critical severity
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