CVE-2021-4188 NULL Pointer Dereference in mruby/mruby
Medium 6.8
Published
Updated
Check this codebase for CVE-2021-4188 and fix it if it is affected.
What it is: CVE-2021-4188 is a medium-severity vulnerability in mruby/mruby, published on 30 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-4188 in the wild and no public exploit code.
Affected product: mruby/mruby. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-4188/ (Markdown: https://insights.sbomify.com/CVE-2021-4188/index.md)
An attacker can cause a denial of service in applications using the mruby library via a NULL pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-4188?
CVE-2021-4188 is a medium-severity vulnerability in mruby/mruby, published on 30 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
mruby is vulnerable to NULL Pointer Dereference
Weakness: CWE-476
Which versions are affected by CVE-2021-4188?
It affects 1 product.
Products include Mruby Mruby.
How do I fix CVE-2021-4188?
No fix has been published for CVE-2021-4188 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-4188 being exploited?
There is no known exploitation of CVE-2021-4188 in the wild and no public exploit code.
Other vulnerabilities in mruby/mruby
Sources
Also known as GHSA-wc43-284g-pqr5, UBUNTU-CVE-2021-4188.