VULNERABILITY INTELLIGENCE

CVE-2021-22873

CVSS score6.1 MEDIUM

EPSS probability69.56%

CISA KEVNot currently listed

Published2021-01-26

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Description

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.

Weakness classification

support@hackerone.com: CWE-601
nvd@nist.gov: CWE-601

Primary references

support@hackerone.com — Third Party Advisory, VDB Entry
support@hackerone.com — Broken Link, Mailing List, Third Party Advisory
support@hackerone.com — Issue Tracking, Third Party Advisory
support@hackerone.com — Exploit, Third Party Advisory
support@hackerone.com — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108 — Broken Link, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory