# CVE-2021-27504: Texas Instruments FREERTOS Integer Overflow or Wraparound

> An integer overflow in FreeRTOS malloc allows attackers to execute arbitrary code on affected Texas Instruments embedded devices.

- **Severity:** High 7.4 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Nov 2023
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-6627-82c3-q8c9

## What is CVE-2021-27504?

CVE-2021-27504 is a high-severity vulnerability in Texas Instruments CC32XX, published on 21 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Texas Instruments devices running FREERTOS, malloc returns a valid 
pointer to a small buffer on extremely large values, which can trigger 
an integer overflow vulnerability in 'malloc' for FreeRTOS, resulting in
 code execution.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2021-27504?

It affects 6 products.


Products: Amazon Freertos, Ti Simplelink Cc13xx Software Development Kit, Ti Simplelink Cc26xx Software Development Kit, Ti Simplelink Cc32xx Software Development Kit, Ti Simplelink Msp432e401y, Ti Simplelink Msp432e411y.

## How do I fix CVE-2021-27504?

No fix has been published for CVE-2021-27504 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27504 being exploited?

There is no known exploitation of CVE-2021-27504 in the wild and no public exploit code.

## Other vulnerabilities in Texas Instruments CC32XX

- [CVE-2021-32020](https://insights.sbomify.com/CVE-2021-32020/): Memory corruption in n/a (critical 9.8)
- [CVE-2021-31571](https://insights.sbomify.com/CVE-2021-31571/): Integer overflow in n/a (critical 9.8)
- [CVE-2021-31572](https://insights.sbomify.com/CVE-2021-31572/): Integer overflow in n/a (critical 9.8)
- [CVE-2026-77234](https://insights.sbomify.com/CVE-2026-77234/): Improper input validation in FreeRTOS-Kernel timer command handling (critical 9.3)
- [CVE-2024-28115](https://insights.sbomify.com/CVE-2024-28115/): Privilege Escalation in FreeRTOS Kernel ARMv7-M MPU ports and ARMv8-M ports with MPU support enabled (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27504 and fix it if it is affected.

What it is: CVE-2021-27504 is a high-severity vulnerability in Texas Instruments CC32XX, published on 21 Nov 2023. 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-2021-27504 in the wild and no public exploit code.

Affected product: Texas Instruments CC32XX. 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-2021-27504/ (Markdown: https://insights.sbomify.com/CVE-2021-27504/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27504
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27504
- OSV: https://osv.dev/vulnerability/CVE-2021-27504

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27504/
Summaries are generated and may contain mistakes; the official description above is the record.