What’s Vulnerable › Vulnerabilities

CVE-2021-27963

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-05 · updated 2026-06-17
• Weakness: CWE-306

Description

SonLogger before 6.4.1 is affected by user creation with any user permissions profile (e.g., SuperAdmin). An anonymous user can send a POST request to /User/saveUser without any authentication or session header.

Affected products

• Sfcyazilim Sonlogger: before 6.4.1 — fixed in 6.4.1

How to fix

Upgrade to a fixed version: Sfcyazilim Sonlogger 6.4.1. Check the vendor advisory for mitigations.

References

• https://github.com/erberkan/SonLogger-vulns
• https://www.sonlogger.com/releasenotes
• https://github.com/erberkan/SonLogger-vulns
• https://www.sonlogger.com/releasenotes

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