Medium severity · published Jan 26, 2021
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
6.1
CVSS
69.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)69.6% · higher than 99% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RA
Revive Adserver · Revive-adserver
before 5.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22873
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22873
Third Party Advisory
http://packetstormsecurity.com/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.html
Broken Link
http://seclists.org/fulldisclosure/2021/Jan/60
Issue Tracking
https://github.com/revive-adserver/revive-adserver/issues/1068
Exploit
https://hackerone.com/reports/1081406
Vendor Advisory
https://www.revive-adserver.com/security/revive-sa-2021-001/
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