# CVE-2025-21283: Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

> Attackers can execute arbitrary code on systems running Microsoft Edge via a memory corruption vulnerability, requiring immediate patching.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 6 Feb 2025
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-24m4-jmrh-xh5r

## What is CVE-2025-21283?

CVE-2025-21283 is a medium-severity memory corruption vulnerability in Microsoft Edge Chromium, published on 6 Feb 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

Weakness: CWE-1222 (Insufficient Granularity of Address Regions Protected by Register Locks)

## Which versions are affected by CVE-2025-21283?

It affects 1 product.


Products: Microsoft Edge Chromium.

## How do I fix CVE-2025-21283?

No fix has been published for CVE-2025-21283 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-21283 being exploited?

There is no known exploitation of CVE-2025-21283 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Edge Chromium

- [CVE-2024-21326](https://insights.sbomify.com/CVE-2024-21326/): Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability (critical 9.6)
- [CVE-2023-35618](https://insights.sbomify.com/CVE-2023-35618/): Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability (critical 9.6)
- [CVE-2023-36735](https://insights.sbomify.com/CVE-2023-36735/): Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability (critical 9.6)
- [CVE-2022-33649](https://insights.sbomify.com/CVE-2022-33649/): Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability (critical 9.6)
- [CVE-2026-58289](https://insights.sbomify.com/CVE-2026-58289/): Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-21283 and fix it if it is affected.

What it is: CVE-2025-21283 is a medium-severity memory corruption vulnerability in Microsoft Edge Chromium, published on 6 Feb 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-21283 in the wild and no public exploit code.

Affected product: Microsoft Edge Chromium. 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-2025-21283/ (Markdown: https://insights.sbomify.com/CVE-2025-21283/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-21283
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-21283
- OSV: https://osv.dev/vulnerability/CVE-2025-21283

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-21283/
Summaries are generated and may contain mistakes; the official description above is the record.