https://lists.yoctoproject.org/g/poky/message/13173 brings a report from a user showing a database with cvss3 all set to 0.0. A complete re-download of the database fixed the issue. It might be related to the fix https://git.openembedded.org/openembedded-core/commit/meta/recipes-core/meta/cve-update-nvd2-native.bb?id=61a5857efdcc0f49c69c0deb24fce99007aeef19 The database seems to be never updated after the fix applied. To be verified.
Maybe fixed by "cve-update-nvd2-native: Fix CVE configuration update" [0]. And "cve-update-nvd2-native: Add an age threshold for incremental update"[1] may help to force the redownload without removing a file in DL_DIR. [0]: https://git.yoctoproject.org/poky/commit/?id=c698cf6723f344ddb1a755b4a2a0996aefa851f4 [1]: https://git.yoctoproject.org/poky/commit/?id=19f27037b2b785673c8f68f19ea783856f732e4d
Closing based on Yoann's comment and lack of any follow-up. Reopen if needed.