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First Time Seen Memcached Writer

Identifies the first successful or no-reply Memcached store command from a client to a server. Memcached commonly has no authentication, so an unauthorized writer can overwrite session tokens, poison cached…

Description

Identifies the first successful or no-reply Memcached store command from a client to a server. Memcached commonly has no authentication, so an unauthorized writer can overwrite session tokens, poison cached application content, or alter security-sensitive state. This behavior can enable session hijacking such as the exposure described by CVE-2026-29093.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
LinuxmacOSWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
event_index

Known benign triggers

  • New application servers, autoscaled workloads, cache warmers, deployment jobs, administrative tools, and failover systems may legitimately write to Memcached for the first time. Validate the client and server roles, affected keys, deployment context, and application behavior before escalating.

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