Bug ID 2259157: Parsing failure may interpret data as a Memcached command

Last Modified: May 05, 2026

Affected Product(s):
BIG-IP TMOS(all modules)

Fixed In:
17.5.1.6, 17.1.3.2

Opened: Mar 28, 2026

Severity: 2-Critical

Symptoms

Some data-body commands (add, set, replace, incr, decr) failed to close connections properly on error, causing request data to be misinterpreted as commands.

Impact

Connection remains open even in the event of command failures, which can result in data being accepted as a command.

Conditions

There is a parsing failure in commands that require data in the request body.

Workaround

N/A

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips