vulsのリモートスキャンでエラー

今週いれたvulsですが、リモートスキャンするとこんなエラーを吐くことがあります。

$ vuls scan example01
Repo rhel-7-server-rpms forced skip_if_unavailable=True due to: /etc/pki/entitlement/7858482913059107368-key.pem
epel/x86_64/metalink                                     | 4.7 kB     00:00     
epel/x86_64                                              | 4.7 kB     00:00     
epel/x86_64/updateinfo                                   | 878 kB     00:00     
epel/x86_64/primary_db                                   | 6.2 MB     00:03     
pgdg96/7Server/x86_64                                    | 4.1 kB     00:00     
remi-safe                                                | 2.9 kB     00:00     
https://cdn.redhat.com/content/dist/rhel/server/7/7Server/x86_64/os/repodata/repomd.xml: [Errno 14] curl#58 - "unable to load client key: -8178 (SEC_ERROR_BAD_KEY)"
他のミラーを試します。


 One of the configured repositories failed (不明),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Run the command with the repository temporarily disabled
            yum --disablerepo=<repoid> ...

     4. Disable the repository permanently, so yum won't use it by default. Yum
        will then just ignore the repository until you permanently enable it
        again or use --enablerepo for temporary usage:

            yum-config-manager --disable <repoid>
        or
            subscription-manager repos --disable=<repoid>

     5. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Can't download repomd.xml for rhel-7-server-rpms/7Server/x86_64

パッケージの更新情報をダウンロードしようとして、なにやら権限がないと怒られている模様。
チェック対象機器上でrootでもってyum check-updateを実行したあとならこのエラーはでません。
なんでだと調べること暫く。どうやら"--deep"オプションをつけて実行してあげると良い模様。

$ vuls scan --deep example01