Add CVSS 3.1 severity for GHSA-g74q-5xw3-j7q9

[sunnypatell]

adds CNA-sourced CVSS 3.1 severity score to this advisory which currently has no CVSS scoring.

• source: NVD (CNA-provided)
• score: 7.5 (HIGH)
• vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

[Copilot]

Pull request overview

This PR adds CNA-sourced CVSS 3.1 severity scoring to advisory GHSA-g74q-5xw3-j7q9 (CVE-2024-21386), a .NET Denial of Service vulnerability that previously had no CVSS scoring. The score of 7.5 (HIGH) with vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H accurately reflects a network-accessible DoS vulnerability with high availability impact and no confidentiality or integrity impact.

Changes:

• Added CVSS 3.1 severity score (7.5 HIGH) to the advisory JSON file
• Added proper JSON formatting (trailing newline)

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[advisory-database]

Hi @sunnypatell! Thank you so much for contributing to the GitHub Advisory Database. This database is free, open, and accessible to all, and it's people like you who make it great. Thanks for choosing to help others. We hope you send in more contributions in the future!