# CVE-2021-26606: DreamSecurity MagicLine Buffer Overflow Vulnerability

> An attacker can remotely execute arbitrary code on Dream Security MagicLine systems by sending a crafted HTTP request due to insufficient certificate validation.

- **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:** 6 Aug 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-56j5-fr4h-4c8q

## What is CVE-2021-26606?

CVE-2021-26606 is a critical memory corruption vulnerability in Dream Security Co.,Ltd MagicLine4NX.exe, published on 6 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in PKI Security Solution of Dream Security could allow arbitrary command execution. This vulnerability is due to insufficient validation of the authorization certificate. An attacker could exploit this vulnerability by sending a crafted HTTP request an affected program. A successful exploit could allow the attacker to remotely execute arbitrary code on a target system.

Weakness: CWE-20 (Improper Input Validation), CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2021-26606?

It affects 1 product.


Products: Dreamsecurity Magicline4nx.exe.

## How do I fix CVE-2021-26606?

No fix has been published for CVE-2021-26606 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26606 being exploited?

There is no known exploitation of CVE-2021-26606 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26606 and fix it if it is affected.

What it is: CVE-2021-26606 is a critical memory corruption vulnerability in Dream Security Co.,Ltd MagicLine4NX.exe, published on 6 Aug 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-2021-26606 in the wild and no public exploit code.

Affected product: Dream Security Co.,Ltd MagicLine4NX.exe. 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-2021-26606/ (Markdown: https://insights.sbomify.com/CVE-2021-26606/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26606
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26606
- OSV: https://osv.dev/vulnerability/CVE-2021-26606

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-26606/
Summaries are generated and may contain mistakes; the official description above is the record.