What’s Vulnerable › Vulnerabilities

CVE-2021-22948

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-23 · updated 2026-06-17
• Weakness: CWE-79

Description

Vulnerability in the generation of session IDs in revive-adserver < 5.3.0, based on the cryptographically insecure uniqid() PHP function. Under some circumstances, an attacker could theoretically be able to brute force session IDs in order to take over a specific account.

Affected products

• Revive Adserver: before 5.3.0; 5.3.0-rc1 — fixed in 5.3.0

How to fix

Upgrade to a fixed version: Revive Adserver 5.3.0. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/1187820
• https://www.revive-adserver.com/security/revive-sa-2021-005/
• https://hackerone.com/reports/1187820
• https://www.revive-adserver.com/security/revive-sa-2021-005/

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