# CVE-2021-27965: Memory corruption in n/a

> A buffer overflow in the MSI Dragon Center kernel driver allows local attackers to escalate privileges and execute arbitrary code via crafted IOCTL requests.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-rf7h-w3mq-vjqq

## What is CVE-2021-27965?

CVE-2021-27965 is a critical memory corruption vulnerability in n/a, published on 5 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The MsIo64.sys driver before 1.1.19.1016 in MSI Dragon Center before 2.0.98.0 has a buffer overflow that allows privilege escalation via a crafted 0x80102040, 0x80102044, 0x80102050, or 0x80102054 IOCTL request.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2021-27965?

It affects 1 product.


Products: Msi Dragon Center.

## How do I fix CVE-2021-27965?

No fix has been published for CVE-2021-27965 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27965 being exploited?

There is no known exploitation of CVE-2021-27965 in the wild and no public exploit code.

Public exploit code:

- stack based buffer overflow in MsIo64.sys, Proof of Concept Local Privilege Escalation to nt authority/system (github_poc): https://github.com/mathisvickie/CVE-2021-27965
- The MsIo64.sys driver before 1.1.19.1016 in MSI Dragon Center before 2.0.98.0 has a buffer overflow that allows privilege escalation via a crafted 0x80102040, 0x80102044, 0x80102050, or 0x80102054 IOCTL request. (github_poc): https://github.com/fengjixuchui/CVE-2021-27965
- Proof of concept for CVE-2021-27965 (Stack-based Buffer Overflow) (github_poc): https://github.com/Jeromeyoung/CVE-2021-27965

## Other vulnerabilities in n/a

- [CVE-2021-44901](https://insights.sbomify.com/CVE-2021-44901/): Privilege escalation in n/a (high 7.8)
- [CVE-2021-29337](https://insights.sbomify.com/CVE-2021-29337/): Privilege escalation in n/a (high 7.8)
- [CVE-2020-13149](https://insights.sbomify.com/CVE-2020-13149/): Privilege escalation in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27965 and fix it if it is affected.

What it is: CVE-2021-27965 is a critical memory corruption vulnerability in n/a, published on 5 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-27965 in the wild and no public exploit code.

Affected product: n/a. 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-2021-27965/ (Markdown: https://insights.sbomify.com/CVE-2021-27965/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27965
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27965
- OSV: https://osv.dev/vulnerability/CVE-2021-27965

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27965/
Summaries are generated and may contain mistakes; the official description above is the record.