Check ID: storage_ensure_minimum_tls_version_12
Provider: Azure
Service: storage
Severity: MEDIUM
Categories: encryption
Resource type: microsoft.storage/storageaccounts

What this check verifies

Azure Storage accounts enforce a minimum TLS version of 1.2 for client connections to data services

Risk

Allowing TLS 1.0/1.1 enables protocol downgrades and exploitation of known flaws (e.g., BEAST), weakening confidentiality and integrity. Attackers can intercept or modify data in transit and harvest credentials via weakened cipher suites.

Recommendation

Set the storage account minimum TLS version to at least 1.2 (prefer 1.3 where supported) and disable legacy protocols. Apply defense in depth by restricting network access, using least privilege credentials, and monitoring handshake failures to identify outdated clients.

Remediation

az storage account update —resource-group <RESOURCE_GROUP> —name <STORAGE_ACCOUNT_NAME> —min-tls-version TLS1_2

References

Where this check fires

This check runs on every scheduled scan against your Azure account. Findings appear at Cloud Security → Findings filterable by Check ID = storage_ensure_minimum_tls_version_12. To re-evaluate after a fix, hit Run now on the account’s schedule under Cloud Security → Schedules — the next scan re-checks this control and marks the finding fixed or keeps it persistent.
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