Improper verification of header fields lets an attacker make the pppd server from ppp-241 access memory it isn’t allowed to, resulting in a crash of the server. There is no possibility of code execution, as there is no data being copied, just a pointer dereferenced.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34849/pppdDoS.txt
Source: https://packetstormsecurity.com/files/34849/pppdDoS.txt.html