Provide references for CVE-2021-22651.
Where can I find more information about CVE-2021-22651?
References are available at: https://us-cert.cisa.gov/ics/advisories/icsa-21-035-01, https://cert-portal.siemens.com/productcert/pdf/ssa-231216.pdf, https://www.zerodayinitiative.com/advisories/ZDI-21-324/.