{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-34021: Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-34021","status":"final","version":"1","initial_release_date":"2026-06-15T10:02:09.049Z","current_release_date":"2026-06-15T13:10:40.668Z","revision_history":[{"date":"2026-06-15T10:02:09.049Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-34021 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-34021"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-34021"},{"category":"external","summary":"wertheim-safes.com","url":"https://wertheim-safes.com/safe-deposit-boxes/"},{"category":"external","summary":"r.sec-consult.com","url":"https://r.sec-consult.com/wertdev"}]},"product_tree":{"branches":[{"category":"vendor","name":"Wertheim GmbH","branches":[{"category":"product_name","name":"Wertheim SafeController 5400 Hardware for VAULT ROOMS (Safe Deposit Locker System - Microcontroller)","branches":[{"category":"product_version","name":"Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320","product":{"name":"Wertheim GmbH Wertheim SafeController 5400 Hardware for VAULT ROOMS (Safe Deposit Locker System - Microcontroller) Wertheim SafeController 5400, Controller 5400 - AssemblyVersion 6.11.8130.22320","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:wertheim_gmbh:wertheim_safecontroller_5400_hardware_for_vault_rooms_\\(safe_deposit_locker_system_-_microcontroller\\):wertheim_safecontroller_5400\\,_controller_5400_-_assemblyversion_6.11.8130.22320:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-34021","title":"Lack of cryptographic protection in Wertheim SafeController 5400 enables RS-485 message sniffing and replay","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","baseScore":8.6,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}