# CVE-2021-28139: Memory corruption in n/a

> Attackers in radio range can trigger arbitrary code execution on ESP32 devices via a crafted Bluetooth LMP packet due to improper feature page restriction.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-jr8m-qx83-r6p3

## What is CVE-2021-28139?

CVE-2021-28139 is a high-severity memory corruption vulnerability in n/a, published on 7 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The Bluetooth Classic implementation in Espressif ESP-IDF 4.4 and earlier does not properly restrict the Feature Page upon reception of an LMP Feature Response Extended packet, allowing attackers in radio range to trigger arbitrary code execution in ESP32 via a crafted Extended Features bitfield payload.

## Which versions are affected by CVE-2021-28139?

It affects 1 product.


Products: Espressif Esp-Idf.

## How do I fix CVE-2021-28139?

No fix has been published for CVE-2021-28139 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-28139 being exploited?

There is no known exploitation of CVE-2021-28139 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2026-45328](https://insights.sbomify.com/CVE-2026-45328/): ESF-IDF: Out-of-Bounds Write in ESP-TEE Secure Service Wrappers (critical 9.3)
- [CVE-2024-53406](https://insights.sbomify.com/CVE-2024-53406/): Auth bypass in n/a (high 8.8)
- [CVE-2024-33453](https://insights.sbomify.com/CVE-2024-33453/): Information disclosure in n/a (high 8.1)
- [CVE-2019-12587](https://insights.sbomify.com/CVE-2019-12587/): Weak cryptography in n/a (high 8.1)
- [CVE-2026-45541](https://insights.sbomify.com/CVE-2026-45541/): ESF-IDF: Remote Null Pointer Dereference in WebSocket Server (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-28139 and fix it if it is affected.

What it is: CVE-2021-28139 is a high-severity memory corruption vulnerability in n/a, published on 7 Sep 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-2021-28139 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-2021-28139/ (Markdown: https://insights.sbomify.com/CVE-2021-28139/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-28139
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-28139
- OSV: https://osv.dev/vulnerability/CVE-2021-28139

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-28139/
Summaries are generated and may contain mistakes; the official description above is the record.