Certificates causing DoS
https://www.bleepingcomputer.com/news/security/openssl-cert-parsing-bug-causes-infinite-denial-of-service-loop/
OpenSSL has released a security update to address a vulnerability in the library that, if exploited, activates an infinite loop function and leads to denial of service conditions.
Denial of service attacks may not be the most disastrous security problem. However, it can still cause significant business interruption, long-term financial repercussions, and brand reputation degradation for those affected.