Null pointer dereference vulnerability exists in multiple vendors MFPs and printers which implement Debut web server 1.2 or 1.3. Processing a specially crafted request may lead an affected product to a denial-of-service (DoS) condition. As for the affected products/models/versions, see the detailed information provided by each vendor.
https://www.fujifilm.com/fbglobal/eng/company/news/notice/2023/browser_announce.html
https://support.brother.com/g/s/security/en/
https://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=group2&faqid=faq00100793_000