Extraction of keywords from advisory misses some terms

[copernico]

For example, in CVE-2019-17567:

Apache HTTP Server versions 2.4.6 to 2.4.46 mod_proxy_wstunnel configured on an URL that is not necessarily Upgraded by the origin server was tunneling the whole connection regardless, thus allowing for subsequent requests on the same connection to pass through with no HTTP validation, authentication or authorization possibly configured.

the term URL is not extracted.

Additional remark

This is also a good example that shows that verbs should be extracted too: configured is not extracted (with the current noun-only approach), but configuration appears in some commit messages and it is potentially relevant to identify the fix commit.