CVE-2021-22889

Name: CVE-2021-22889
Creator: NVD / NIST
Published: 2021-03-25T20:15:12.617+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 36.33%

Last modified Jun 17, 2026

CVE-2021-22889 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Revive Adserver before v5.2.0 is vulnerable to a reflected XSS vulnerability in the `statsBreakdown` parameter of stats.php (and possibly other scripts) due to single quotes not being escaped. An attacker could trick a user with access to the user interface of a Revive Adserver instance into clicking on a specifically crafted URL and pressing a certain key combination to execute injected JavaScript code.. EPSS estimates a 36.33% chance of exploitation in the next 30 days.

Description

Revive Adserver before v5.2.0 is vulnerable to a reflected XSS vulnerability in the `statsBreakdown` parameter of stats.php (and possibly other scripts) due to single quotes not being escaped. An attacker could trick a user with access to the user interface of a Revive Adserver instance into clicking on a specifically crafted URL and pressing a certain key combination to execute injected JavaScript code.

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

36.33%

98.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Revive-Adserver	Revive Adserver	< 5.2.0

References

https://github.com/revive-adserver/revive-adserver/commit/2f868414Patch, Third Party Advisory
https://hackerone.com/reports/1097217Exploit, Third Party Advisory
https://www.revive-adserver.com/security/revive-sa-2021-003/Vendor Advisory
https://github.com/revive-adserver/revive-adserver/commit/2f868414Patch, Third Party Advisory
https://hackerone.com/reports/1097217Exploit, Third Party Advisory
https://www.revive-adserver.com/security/revive-sa-2021-003/Vendor Advisory

Timeline

Published: Mar 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22889?

How severe is CVE-2021-22889?

CVE-2021-22889 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 36.33% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22889?

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-2021-22889?

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

Scan your code now

Source: NVD / NIST