"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 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 warns that if your Wi-Fi box has filled its flash with junk, it may not have enough internal storage space to hold the updated OS, potentially leading to a bootloop."
"The advisory also lists over 230 models of Cisco access points that run the rotten versions of IOS XE, providing a procedure to test for the presence of the offending releases."
Cisco revealed that over 230 models of its Wi-Fi access points generate a daily log file, cnssdaemon.log, that grows by 5MB and cannot be deleted. This accumulation can lead to insufficient disk space for software updates, potentially causing access points to fail in downloading new software. The issue stems from specific versions of Cisco IOS XE. Cisco advises upgrading to a version that does not generate the log file, but warns that devices may lack the necessary space for the update, risking bootloops.
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