What is CVE-2025-55740?

CVE-2025-55740 is a medium-severity vulnerability in Anipaleja Nginx-Defender, classified under CWE-1392. CVSS score: 6.5/10. Published 2025-08-19.

How severe is CVE-2025-55740?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Anipaleja Nginx-Defender

CVE-2025-55740

nginx-defender is a high-performance, enterprise-grade Web Application Firewall (WAF) and threat detection system engineered for modern web infrastructure. This is a configuration vulnerability affecting nginx-defender deployments. Example configuration files config.yaml and docker-compose.yml contain default credentials (default_password: "change_me_please", GF_SECURITY_ADMIN_PASSWORD=admin123). If users deploy nginx-defender without changing these defaults, attackers with network access could gain administrative control, bypassing security protections. The issue is addressed in v1.5.0 and later.

EPSS: 0.002 (15.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Anipaleja Nginx-defender — versions < 1.5.0

Weakness classification (CWE)

CWE-1392

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2025-55740?: CVE-2025-55740 is a medium-severity vulnerability in Anipaleja Nginx-Defender, classified under CWE-1392. CVSS score: 6.5/10. Published 2025-08-19.
How severe is CVE-2025-55740?: Medium severity. CVSS v3 base score is 6.5 out of 10.