CVE-2021-27963
HIGHCVSS 8.2/10EPSS 2.45%
Last modified
CVE-2021-27963 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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.. EPSS estimates a 2.45% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Sfcyazilim | Sonlogger | < 6.4.1 |
References
- https://github.com/erberkan/SonLogger-vulnsExploit, Third Party Advisory
- https://www.sonlogger.com/releasenotesRelease Notes, Vendor Advisory
- https://github.com/erberkan/SonLogger-vulnsExploit, Third Party Advisory
- https://www.sonlogger.com/releasenotesRelease Notes, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27963?
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.
How severe is CVE-2021-27963?
CVE-2021-27963 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 2.45% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27963?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-27963?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST