# Cobalt Strike's ExternalC2 framework vs Pupy: side-by-side comparison (2026)

[Cobalt Strike's ExternalC2 framework](https://cybersectools.com/tools/cobalt-strikes-externalc2-framework) is a free [red-team & adversary emulation](https://cybersectools.com/categories/offensive-security) solution. [Pupy](https://cybersectools.com/tools/pupy) is a free [red-team & adversary emulation](https://cybersectools.com/categories/offensive-security) solution. Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Cobalt Strike's ExternalC2 framework | Pupy |
|---|---|---|
| Pricing model | Free | Free |
| Category | Red-Team & Adversary Emulation | Red-Team & Adversary Emulation |
| Verified | No | No |
| Deployment type | On-Premises | On-Premises |
| Company size fit | Enterprise | Mid-Market, Enterprise |
| GitHub stars | – | 8,948 |
| Last commit | – | Feb 2024 |

### Use cases and capabilities

| | Cobalt Strike's ExternalC2 framework | Pupy |
|---|---|---|
| C2 | Yes | Yes |
| Post Exploitation | – | Yes |
| Red Team | – | Yes |

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [Pupy](https://cybersectools.com/tools/pupy) fits if you are a mid-market company and you want an open-source product.

## Cobalt Strike's ExternalC2 framework vs Pupy FAQ

Common questions when comparing Cobalt Strike's ExternalC2 framework vs Pupy for red-team & adversary emulation.

### What is the difference between Cobalt Strike's ExternalC2 framework and Pupy?

**Cobalt Strike's ExternalC2 framework**: A specification/framework for extending default C2 communication channels in Cobalt Strike.

**Pupy**: Pupy is an open-source, cross-platform C2 framework that provides remote access and control capabilities for compromised systems across Windows, Linux, OSX, and Android platforms.

The table above shows where their features, integrations, deployment and company size fit differ.

### Is Cobalt Strike's ExternalC2 framework a good alternative to Pupy?

Often, yes. Cobalt Strike's ExternalC2 framework and Pupy are both Red-Team & Adversary Emulation products, and both cover C2. Key differences: Pupy is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Cobalt Strike's ExternalC2 framework vs Fortra Cobalt Strike](https://cybersectools.com/compare/cobalt-strikes-externalc2-framework-vs-fortra-cobalt-strike)
- [Cobalt Strike's ExternalC2 framework vs Core Security Cobalt Strike](https://cybersectools.com/compare/cobalt-strikes-externalc2-framework-vs-core-security-cobalt-strike)
- [Cobalt Strike's ExternalC2 framework vs Core Security Outflank Security Tooling](https://cybersectools.com/compare/cobalt-strikes-externalc2-framework-vs-core-security-outflank-security-tooling)
- [Pupy vs Fortra Cobalt Strike](https://cybersectools.com/compare/fortra-cobalt-strike-vs-pupy)
- [Pupy vs Core Security Cobalt Strike](https://cybersectools.com/compare/core-security-cobalt-strike-vs-pupy)
- [Pupy vs Core Security Outflank Security Tooling](https://cybersectools.com/compare/core-security-outflank-security-tooling-vs-pupy)

## Alternatives to each

- [See all Cobalt Strike's ExternalC2 framework alternatives](https://cybersectools.com/alternatives/cobalt-strikes-externalc2-framework)
- [See all Pupy alternatives](https://cybersectools.com/alternatives/pupy)

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Source: https://cybersectools.com/compare/cobalt-strikes-externalc2-framework-vs-pupy

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/cobalt-strikes-externalc2-framework.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Cobalt Strike's ExternalC2 framework and Pupy: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md