CVE Alert: CVE-2025-59271 – Microsoft – Azure Cache for Redis Enterprise

Risk verdict

High-severity remote privilege-escalation vulnerability with no user interaction; risk is elevated for internet- or publicly exposed Azure Cache for Redis Enterprise and Azure Managed Redis deployments.

Why this matters

An attacker could escalate to administrative control, read or modify sensitive data, or pivot to adjacent services, given the scope-changing impact. In cloud cache environments, a successful exploit can disrupt authentication/session handling, degrade performance, or enable broader access to tenant resources if misconfigurations exist.

Most likely attack path

Remote attacker can exploit over the network (AV:N) without privileges (PR:N) and without user interaction (UI:N); the vulnerability enables elevation of privilege with high confidentiality and integrity impact (C:H, I:H) and scope change (S:C). In practice, exploitation could enable administration of the cache layer or leakage/pivoting to related services, potentially bypassing normal access controls.

Who is most exposed

Customers running Microsoft Azure Cache for Redis Enterprise or Azure Managed Redis, especially those with publicly reachable endpoints or lax network isolation in cloud deployments.

Detection ideas

• Look for unexpected admin-level changes or ACL modifications in Redis management interfaces.
• Sudden spikes in elevated-privilege activity or unusual command sequences (e.g., suspicious CONFIG/ACL uses).
• Anomalous authentication events or privilege escalations tied to Redis endpoints.
• Unusual data access patterns or data exfiltration attempts from the cache layer.
• Network traffic to Redis endpoints from untrusted sources or at odd times.

Mitigation and prioritisation

• Apply vendor patch/update as a priority once available; verify patch applicability in staging first.
• Restrict exposure: remove public endpoints, enforce tight network controls, and employ IP allow-lists or private access.
• Enforce strong identity/least privilege for management planes; rotate credentials after patch.
• Enable robust monitoring on Redis management and data-plane activities; alert on abnormal ACL/role changes.
• If KEV or EPSS indicators become available (EPSS ≥ 0.5 or KEV flagged), escalate to priority 1.