CVE-2021-4188
HIGHCVSS 7.5/10EPSS 0.84%
Last modified
CVE-2021-4188 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. mruby is vulnerable to NULL Pointer Dereference. EPSS estimates a 0.84% chance of exploitation in the next 30 days.
Description
mruby is vulnerable to NULL Pointer Dereference
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mruby | Mruby | <= 3.0.0 |
References
- https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8Patch, Third Party Advisory
- https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28Exploit, Patch, Third Party Advisory
- https://github.com/mruby/mruby/commit/27d1e0132a0804581dca28df042e7047fd27eaa8Patch, Third Party Advisory
- https://huntr.dev/bounties/78533fb9-f3e0-47c2-86dc-d1f96d5bea28Exploit, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-4188?
mruby is vulnerable to NULL Pointer Dereference
How severe is CVE-2021-4188?
CVE-2021-4188 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4188?
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-2021-4188?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST