CVE-2020-15866
CRITICALCVSS 9.8/10EPSS 2.07%
Last modified
CVE-2020-15866 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. mruby through 2.1.2-rc has a heap-based buffer overflow in the mrb_yield_with_class function in vm.c because of incorrect VM stack handling. It can be triggered via the stack_copy function.. EPSS estimates a 2.07% chance of exploitation in the next 30 days.
Description
mruby through 2.1.2-rc has a heap-based buffer overflow in the mrb_yield_with_class function in vm.c because of incorrect VM stack handling. It can be triggered via the stack_copy function.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Mruby | Mruby | <= 2.1.1 | — |
| Mruby | Mruby | 2.1.2 | Rc |
| Debian | Debian Linux | 9.0 | — |
References
- https://github.com/mruby/mruby/issues/5042Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/05/msg00006.htmlMailing List, Third Party Advisory
- https://github.com/mruby/mruby/issues/5042Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/05/msg00006.htmlMailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-15866?
mruby through 2.1.2-rc has a heap-based buffer overflow in the mrb_yield_with_class function in vm.c because of incorrect VM stack handling. It can be triggered via the stack_copy function.
How severe is CVE-2020-15866?
CVE-2020-15866 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.07% probability of exploitation in the next 30 days.
How do I fix CVE-2020-15866?
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-2020-15866?
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