All version of Ewon Flexy and Cosy prior to 14.1 use wildcards such as (*) under which domains can request resources. An attacker with local access and high privileges could inject scripts into the Cross-origin Resource Sharing (CORS) configuration that could abuse this vulnerability, allowing the attacker to retrieve limited confidential information through sniffing.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-16230
• https://us-cert.cisa.gov/ics/advisories/icsa-20-254-03
• https://us-cert.cisa.gov/ics/advisories/icsa-20-289-01
• https://us-cert.cisa.gov/ics/advisories/icsa-21-075-01