Provide references for CVE-2021-27646.
Where can I find more information about CVE-2021-27646?
References are available at: https://www.synology.com/security/advisory/Synology_SA_20_26, https://www.zerodayinitiative.com/advisories/ZDI-21-340/, https://www.zerodayinitiative.com/advisories/ZDI-21-339/.