Proself Enterprise/Standard Edition Ver5.62 and earlier, Proself Gateway Edition Ver1.65 and earlier, and Proself Mail Sanitize Edition Ver1.08 and earlier allow a remote unauthenticated attacker to conduct XML External Entity (XXE) attacks. By processing a specially crafted request containing malformed XML data, arbitrary files on the server containing account information may be read by the attacker.
https://www.securityweek.com/cisa-warns-of-zyxel-firewall-vulnerability-exploited-in-attacks/
https://thehackernews.com/2024/11/cisa-urges-agencies-to-patch-critical.html
https://www.cybereason.com/blog/cuckoo-spear-analyzing-noopdoor