Revive Adserver before 5.1.0 contains an open redirect vulnerability via the dest, oadest, and ct0 parameters of the lg.php and ck.php delivery scripts. An attacker can redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.
View the template here CVE-2021-22873.yaml
References:
https://nvd.nist.gov/vuln/detail/CVE-2021-22873