# CVE-2021-28455: Microsoft Jet Red Database Engine and Access Connectivity Engine Remote Code Execution Vulnerability

> Attackers can execute arbitrary code by exploiting a vulnerability in the Microsoft Jet Red Database Engine and Access Connectivity Engine.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-2m6v-mggf-5f9g

## What is CVE-2021-28455?

CVE-2021-28455 is a high-severity code injection vulnerability in Microsoft 365 Apps, published on 11 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Microsoft Jet Red Database Engine and Access Connectivity Engine Remote Code Execution Vulnerability

## Which versions are affected by CVE-2021-28455?

It affects 10 products.


Products: Microsoft 365 Apps, Microsoft Office, Microsoft Windows 10, Microsoft Windows 7, Microsoft Windows 8.1, Microsoft Windows Rt 8.1, Microsoft Windows Server 2008, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019.

## How do I fix CVE-2021-28455?

No fix has been published for CVE-2021-28455 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-28455 being exploited?

There is no known exploitation of CVE-2021-28455 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft 365 Apps

- [CVE-2024-21413](https://insights.sbomify.com/CVE-2024-21413/): Microsoft Outlook Improper Input Validation (critical 9.8, exploited in the wild)
- [CVE-2023-23397](https://insights.sbomify.com/CVE-2023-23397/): Microsoft Office Outlook Privilege Escalation (critical 9.8, exploited in the wild)
- [CVE-2024-38189](https://insights.sbomify.com/CVE-2024-38189/): Microsoft Project Remote Code Execution Vulnerability (high 8.8, exploited in the wild)
- [CVE-2023-35311](https://insights.sbomify.com/CVE-2023-35311/): Microsoft Outlook Security Feature Bypass (high 8.8, exploited in the wild)
- [CVE-2026-21514](https://insights.sbomify.com/CVE-2026-21514/): Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-28455 and fix it if it is affected.

What it is: CVE-2021-28455 is a high-severity code injection vulnerability in Microsoft 365 Apps, published on 11 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-28455 in the wild and no public exploit code.

Affected product: Microsoft 365 Apps. 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-2021-28455/ (Markdown: https://insights.sbomify.com/CVE-2021-28455/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-28455
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-28455
- OSV: https://osv.dev/vulnerability/CVE-2021-28455

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-28455/
Summaries are generated and may contain mistakes; the official description above is the record.