# CVE-2021-32639: Server-Side Request Forgery (SSRF) in emissary:emissary


- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 2 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-2p8j-2rf3-h4xr

## What is CVE-2021-32639?

CVE-2021-32639 is a high-severity vulnerability in NationalSecurityAgency emissary, published on 2 Jul 2021. 

### Official description

Emissary is a P2P-based, data-driven workflow engine. Emissary version 6.4.0 is vulnerable to Server-Side Request Forgery (SSRF). In particular, the `RegisterPeerAction` endpoint and the `AddChildDirectoryAction` endpoint are vulnerable to SSRF. This vulnerability may lead to credential leaks. Emissary version 7.0 contains a patch. As a workaround, disable network access to Emissary from untrusted sources.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2021-32639?

It affects 1 product.


Products: Nsa Emissary.

## How do I fix CVE-2021-32639?

No fix has been published for CVE-2021-32639 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-32639 being exploited?

There is no known exploitation of CVE-2021-32639 in the wild and no public exploit code.

## Other vulnerabilities in NationalSecurityAgency emissary

- [CVE-2026-35580](https://insights.sbomify.com/CVE-2026-35580/): Emissary has GitHub Actions Shell Injection via Workflow Inputs (critical 9.1)
- [CVE-2026-35582](https://insights.sbomify.com/CVE-2026-35582/): Emissary has an OS Command Injection via Unvalidated IN_FILE_ENDING / OUT_FILE_ENDING in Executrix (high 8.8)
- [CVE-2021-32094](https://insights.sbomify.com/CVE-2021-32094/): File upload in n/a (high 8.8)
- [CVE-2021-32096](https://insights.sbomify.com/CVE-2021-32096/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2021-32095](https://insights.sbomify.com/CVE-2021-32095/): Missing authorization in n/a (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32639 and fix it if it is affected.

What it is: CVE-2021-32639 is a high-severity vulnerability in NationalSecurityAgency emissary, published on 2 Jul 2021. 
Exploitation: There is no known exploitation of CVE-2021-32639 in the wild and no public exploit code.

Affected product: NationalSecurityAgency emissary. 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-2021-32639/ (Markdown: https://insights.sbomify.com/CVE-2021-32639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32639
- OSV: https://osv.dev/vulnerability/CVE-2021-32639

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32639/
Summaries are generated and may contain mistakes; the official description above is the record.