Provide references for CVE-2021-43556.
Where can I find more information about CVE-2021-43556?
References are available at: https://us-cert.cisa.gov/ics/advisories/icsa-21-320-01, https://www.zerodayinitiative.com/advisories/ZDI-22-029/, https://www.zerodayinitiative.com/advisories/ZDI-22-032/, https://www.zerodayinitiative.com/advisories/ZDI-22-031/.