# CVE-2021-26622: Genian NAC remote code execution vulnerability

> Remote attackers can execute arbitrary code with SYSTEM privileges on Genian NAC nodes via Server-Side Template Injection and insufficient validation.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/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:** 25 Mar 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-q8rg-c9v7-62r5

## What is CVE-2021-26622?

CVE-2021-26622 is a critical code injection vulnerability in Genians Co., Ltd Genian NAC Suite V4.0, published on 25 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An remote code execution vulnerability due to SSTI vulnerability and insufficient file name parameter validation was discovered in Genian NAC. Remote attackers are able to execute arbitrary malicious code with SYSTEM privileges on all connected nodes in NAC through this vulnerability.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-26622?

It affects 1 product.


Products: Genians Genian Nac.

## How do I fix CVE-2021-26622?

No fix has been published for CVE-2021-26622 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26622 being exploited?

There is no known exploitation of CVE-2021-26622 in the wild and no public exploit code.

## Other vulnerabilities in Genians Co., Ltd Genian NAC Suite V4.0

- [CVE-2023-40254](https://insights.sbomify.com/CVE-2023-40254/): Supply chain in Genian NAC Suite V5.0 (high 7.5)
- [CVE-2023-40252](https://insights.sbomify.com/CVE-2023-40252/): Code injection in Genian NAC Suite V5.0 (medium 6.0)
- [CVE-2023-40253](https://insights.sbomify.com/CVE-2023-40253/): Auth bypass in Genian NAC Suite V5.0 (medium 6.0)
- [CVE-2023-40251](https://insights.sbomify.com/CVE-2023-40251/): Weak cryptography in Genian NAC Suite V5.0 (medium 5.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26622 and fix it if it is affected.

What it is: CVE-2021-26622 is a critical code injection vulnerability in Genians Co., Ltd Genian NAC Suite V4.0, published on 25 Mar 2022. 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-2021-26622 in the wild and no public exploit code.

Affected product: Genians Co., Ltd Genian NAC Suite V4.0. 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-2021-26622/ (Markdown: https://insights.sbomify.com/CVE-2021-26622/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26622
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26622
- OSV: https://osv.dev/vulnerability/CVE-2021-26622

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-26622/
Summaries are generated and may contain mistakes; the official description above is the record.