Samba: 4.19.9 → 4.21.0

Upgrade impact: Minor upgrade. Minor releases are usually backwards-compatible, but can add or change behaviour — test in staging before production.

Fixed by upgrading to 4.21.0 iVulnerabilities that affect 4.19.9 but no longer affect 4.21.0 — the security gain from this upgrade, by exploited status then exploitation probability.

Exploited first, then by exploitation probability (EPSS).

Still open in 4.21.0 iKnown vulnerabilities that affect 4.21.0 too — upgrading to it does not clear these.

These affect 4.21.0 as well — a later release may be needed.