Linksys WRT54g firmware 1.00.9 does not require credentials when making configuration changes, which allows remote attackers to modify arbitrary configurations via a direct request to Security.tri, as demonstrated using the SecurityMode and layout parameters, a different issue than CVE-2006-2559.
https://www.exploit-db.com/exploits/5926
https://kinqpinz.info/lib/wrt54g/own2.txt
https://kinqpinz.info/lib/wrt54g/