CVE-2021-22873
Revive Adserver before 5.1.0 is vulnerable to open redirects via the dest, oadest, and/or ct0 parameters of the lg.php and ck.php delivery scripts. Such...
- Published
- Jan 21, 2021
- Updated
- Aug 3, 2024
- Assigning CNA
- hackerone
- Evidence observed
- Aug 5, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NHigh · next 30 days
- Percentile
- 99.4%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Revive Adserver before 5.1.0 is vulnerable to open redirects via the `dest`, `oadest`, and/or `ct0` parameters of the lg.php and ck.php delivery scripts. Such open redirects had previously been available by design to allow third party ad servers to track such metrics when delivering ads. However, third party click tracking via redirects is not a viable option anymore, leading to such open redirect functionality being removed and reclassified as a vulnerability.
Sources
1A PoC exploit for CVE-2021-22873 - Revive Adserver Open Redirect Vulnerability.
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