One such example is CVE-2023-45853 [1]. Zlib included in it's source an extra set of utilities and add-ons. One such utility, MiniZip, had a buffer overflow vulnerability. BAM, 8.8 CVE (was a 9, looks like they pulled it back a bit). But not one that the 99% of applications using zlib would ever be vulnerable to because almost nobody used the MiniZip utility. It was so unused that the solution for zlib was to simply remove it.
I know about this one particularly because our security policy required us to do a BUNCH of pointless updates for it since zlib is in just about everything.
I suppose all these fake issues and the many more that have absurdly elevated severities could be considered an attack on the system itself, stripping it of credibility.
CVE-1972-404: The code is written in C. ^_^
However if I was writing this response just one year ago I would instead be saying: the majority off LLM CVS are noise where the code is correct, and often they are writing up for code that doesn't even exist.
Which is to say I suspect the repo in question was generated with a year-old LLM, since they act like that. The new ones [mostly?] are much better.
Still, if a modern LLM points out something you should fix it. Even if we can't figure out how to exploit it today that doesn't mean we won't figure it out in the future.
This is not true if you consider security-in-depth. Many of them are exploitable on their own but maybe not in combination with other issues that are as yet unknown or known but not patched everywhere.
As a simple example a local privilege escalation issue that is not exploitable on a device that only I ever have access to, essentially becomes a remote root access flaw if you have untrusted or unreliable users (clients with accounts for instance) on the system. This works on a finer grain too, seemingly minor issues spread through the kernel and user space can add up to a serious exploit.
I convinced the customer to accept the delivery by pointing out that (1) our app had zero lines of ocaml and (2) the feature had been implemented in the ocaml driver since the CVE was issued.
Perhaps in isolation. The issue is when you can chain exploits to bypass multiple layers.