What’s Vulnerable › Vulnerabilities

CVE-2021-22872

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-26 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• Revive Adserver: before 5.1.0 — fixed in 5.1.0

How to fix

Upgrade to a fixed version: Revive Adserver 5.1.0. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.html
• http://seclists.org/fulldisclosure/2021/Jan/60
• https://github.com/revive-adserver/revive-adserver/commit/00fdb8d0e
• https://github.com/revive-adserver/revive-adserver/commit/1dbcf7d50
• https://hackerone.com/reports/986365
• https://www.revive-adserver.com/security/revive-sa-2021-001/
• http://packetstormsecurity.com/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.html
• http://seclists.org/fulldisclosure/2021/Jan/60
• https://github.com/revive-adserver/revive-adserver/commit/00fdb8d0e
• https://github.com/revive-adserver/revive-adserver/commit/1dbcf7d50
• https://hackerone.com/reports/986365
• https://www.revive-adserver.com/security/revive-sa-2021-001/

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