CVE-2021-22873

Public Exploit

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.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 66.61% Top 5%
Vendor Advisory revive-adserver.com
Affected: n/a https://github.com/revive-adserver/revive-adserver
Published at:
Updated at:

References

Link Tags
https://hackerone.com/reports/1081406 third party advisory exploit
https://www.revive-adserver.com/security/revive-sa-2021-001/ vendor advisory
https://github.com/revive-adserver/revive-adserver/issues/1068 issue tracking third party advisory
http://seclists.org/fulldisclosure/2021/Jan/60 mailing list third party advisory broken link
http://packetstormsecurity.com/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.html vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-22873?
CVE-2021-22873 has been scored as a medium severity vulnerability.
How to fix CVE-2021-22873?
To fix CVE-2021-22873, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-22873 being actively exploited in the wild?
It is possible that CVE-2021-22873 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~67% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-22873?
CVE-2021-22873 affects n/a https://github.com/revive-adserver/revive-adserver.
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