This issue is not exploitable by itself. However, it is considered a security issue as it could potentially result in an increase in what could be accomplished by exploiting another security vulnerability in Swift.
Seems a little clumsy to me, perhaps:
We do not believe that this vulnerability is directly exploitable but it may be possible to leverage it as part of an attack involving other vulnerabilities in Swift....
This issue is not exploitable by itself. However, it is considered a security issue as it could potentially result in an increase in what could be accomplished by exploiting another security vulnerability in Swift.
Seems a little clumsy to me, perhaps:
We do not believe that this vulnerability is directly exploitable but it may be possible to leverage it as part of an attack involving other vulnerabilities in Swift....