mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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CVE Program

T-Mobile US is now a CVE Numbering Authority (CNA) assigning CVE IDs for all T-Mobile US products (including end-of-life/end-of-service products) + vulnerabilities in third-party software/hardware discovered by T-Mobile US that are not in another CNA’s scope

cve.org/Media/News/item/news/2