What is CVE-2025-52666?

CVE-2025-52666 is a low-severity vulnerability in Revive Adserver, classified under Use of Externally-Controlled Format String. CVSS score: 2.7/10. Published 2025-11-20.

How severe is CVE-2025-52666?

Low severity. CVSS v3 base score is 2.7 out of 10.

Vulnerability in Revive Adserver

CVE-2025-52666

Improper neutralisation of format characters in the settings of Revive Adserver 5.5.2 and 6.0.1 and earlier versions causes an administrator user to disable the admin user console due to a fatal PHP error.

Published 2025-11-20 · last modified 2026-09-26.

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (34.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Revive Adserver — versions 6.0.1, 5.5.2, 6.0.2
Revive-Adserver Revive Adserver

Weakness classification (CWE)

CWE-134 — Use of Externally-Controlled Format String

References

hackerone.com/reports/3399218 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2025-52666?: CVE-2025-52666 is a low-severity vulnerability in Revive Adserver, classified under Use of Externally-Controlled Format String. CVSS score: 2.7/10. Published 2025-11-20.
How severe is CVE-2025-52666?: Low severity. CVSS v3 base score is 2.7 out of 10.