CVE-2026-34021
Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay
Description
The Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320, uses RS-485 communication between the server and the microcontroller without cryptographic protection. An attacker with access to the communication path between the server and the microcontroller can sniff RS-485 messages and replay previously observed messages. This can be used, for example, to spoof a "quit alarm" message and continuously deactivate the safe alarm.
INFO
Published Date :
June 15, 2026, 12:16 p.m.
Last Modified :
June 15, 2026, 12:16 p.m.
Remotely Exploit :
No
Source :
551230f0-3615-47bd-b7cc-93e92e730bbf
Affected Products
The following products are affected by CVE-2026-34021
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 551230f0-3615-47bd-b7cc-93e92e730bbf | ||||
| CVSS 4.0 | HIGH | 551230f0-3615-47bd-b7cc-93e92e730bbf |
Solution
- Implement cryptographic protection for RS-485 communication.
- Validate message authenticity and integrity.
- Disable message replay functionality.
- Update device firmware to the latest version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34021.
| URL | Resource |
|---|---|
| https://r.sec-consult.com/wertdev | |
| https://wertheim-safes.com/safe-deposit-boxes/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34021 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34021
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34021 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34021 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 551230f0-3615-47bd-b7cc-93e92e730bbf
Jun. 15, 2026
Action Type Old Value New Value Added Description The Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320, uses RS-485 communication between the server and the microcontroller without cryptographic protection. An attacker with access to the communication path between the server and the microcontroller can sniff RS-485 messages and replay previously observed messages. This can be used, for example, to spoof a "quit alarm" message and continuously deactivate the safe alarm. Added CVSS V4.0 AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-294 Added Reference https://r.sec-consult.com/wertdev Added Reference https://wertheim-safes.com/safe-deposit-boxes/