# CVE-2021-27102: Accellion FTA OS Command Injection

> Attackers can execute arbitrary OS commands via a local web service call in Accellion FTA, requiring an upgrade to the fixed version.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 3 Nov 2021 (CISA KEV), used in ransomware
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Feb 2021
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-vcwv-2759-43q3

## What is CVE-2021-27102?

CVE-2021-27102 is a high-severity command injection vulnerability in n/a, published on 16 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Accellion FTA 9_12_411 and earlier is affected by OS command execution via a local web service call. The fixed version is FTA_9_12_416 and later.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2021-27102?

It affects 1 product.


Products: Accellion Fta.

## How do I fix CVE-2021-27102?

No fix has been published for CVE-2021-27102 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.

## Is CVE-2021-27102 being exploited?

Yes. Attackers have exploited CVE-2021-27102 in the wild since at least 3 Nov 2021, including in ransomware campaigns.

## Other vulnerabilities in n/a

- [CVE-2021-27101](https://insights.sbomify.com/CVE-2021-27101/): Accellion FTA SQL Injection (critical 9.8, exploited in the wild)
- [CVE-2021-27103](https://insights.sbomify.com/CVE-2021-27103/): Accellion FTA Server-Side Request Forgery (SSRF) (critical 9.8, exploited in the wild)
- [CVE-2021-27104](https://insights.sbomify.com/CVE-2021-27104/): Accellion FTA OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-27730](https://insights.sbomify.com/CVE-2021-27730/): Command injection in n/a (critical 9.8)
- [CVE-2021-27731](https://insights.sbomify.com/CVE-2021-27731/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27102 and fix it if it is affected.

What it is: CVE-2021-27102 is a high-severity command injection vulnerability in n/a, published on 16 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2021-27102 in the wild since at least 3 Nov 2021, including in ransomware campaigns.

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-2021-27102/ (Markdown: https://insights.sbomify.com/CVE-2021-27102/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27102
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27102
- OSV: https://osv.dev/vulnerability/CVE-2021-27102

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-27102/
Summaries are generated and may contain mistakes; the official description above is the record.