CVE-2021-22872

Name: CVE-2021-22872
Creator: NVD / NIST
Published: 2021-01-26T18:16:19.1+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 3.45%

Last modified Jun 17, 2026

CVE-2021-22872 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Revive Adserver before 5.1.0 is vulnerable to a reflected cross-site scripting (XSS) vulnerability via the publicly accessible afr.php delivery script. While this issue was previously addressed in modern browsers as CVE-2020-8115, some older browsers (e.g., IE10) that do not automatically URL encode parameters were still vulnerable.. EPSS estimates a 3.45% chance of exploitation in the next 30 days.

Description

Revive Adserver before 5.1.0 is vulnerable to a reflected cross-site scripting (XSS) vulnerability via the publicly accessible afr.php delivery script. While this issue was previously addressed in modern browsers as CVE-2020-8115, some older browsers (e.g., IE10) that do not automatically URL encode parameters were still vulnerable.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

3.45%

87.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Revive-Adserver	Revive Adserver	< 5.1.0

References

http://packetstormsecurity.com/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.htmlThird Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Jan/60Broken Link, Mailing List, Third Party Advisory
https://github.com/revive-adserver/revive-adserver/commit/00fdb8d0ePatch, Third Party Advisory
https://github.com/revive-adserver/revive-adserver/commit/1dbcf7d50Patch, Third Party Advisory
https://hackerone.com/reports/986365Exploit, Third Party Advisory
https://www.revive-adserver.com/security/revive-sa-2021-001/Vendor Advisory
http://packetstormsecurity.com/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.htmlThird Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Jan/60Broken Link, Mailing List, Third Party Advisory
https://github.com/revive-adserver/revive-adserver/commit/00fdb8d0ePatch, Third Party Advisory
https://github.com/revive-adserver/revive-adserver/commit/1dbcf7d50Patch, Third Party Advisory
https://hackerone.com/reports/986365Exploit, Third Party Advisory
https://www.revive-adserver.com/security/revive-sa-2021-001/Vendor Advisory

Timeline

Published: Jan 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22872?

How severe is CVE-2021-22872?

CVE-2021-22872 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 3.45% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22872?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22872?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST