By Simon Sharwood
Publication Date: 2026-04-17 04:35:00
More than 230 different models of Cisco Wi-Fi access points may be writing 5MB a day of nonessential data, filling their onboard flash memory to the point at which they lack space for future software updates.
The networking giant revealed the mess earlier this week in an advisory that warns “Certain Cisco Access Points (APs) may fail to download new software images or Access Point Service Packs.”
The reason for the mess is an updated library in Cisco IOS XE – specifically versions 17.12.4, 17.12.5, 17.12.6, and 17.12.6a – which sees access points generate a log file named cnssdaemon.log.
Cisco says that file grows by 5MB every day and can’t be deleted from the command line interface.
