# Mercury vs Viettel VCS-NSM: side-by-side comparison (2026)

[Mercury](https://cybersectools.com/tools/mercury) is a free [network detection and response](https://cybersectools.com/categories/ndr) solution. [Viettel VCS-NSM](https://cybersectools.com/tools/viettel-vcs-nsm) is a commercial [network detection and response](https://cybersectools.com/categories/ndr) solution by [Viettel Security](https://cybersectools.com/companies/viettel-security). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Mercury | Viettel VCS-NSM |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | Network Detection and Response | Network Detection and Response |
| Verified | No | No |
| Deployment type | On-Premises | On-Premises |
| Company size fit | Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| GitHub stars | 501 | – |
| Last commit | Mar 2026 | – |
| Company | – | Viettel Security |
| Headquarters | – | – |

### Use cases and capabilities

| | Mercury | Viettel VCS-NSM |
|---|---|---|
| PCAP | Yes | Yes |
| Packet Capture | Yes | – |
| APT | – | Yes |
| Anomaly Detection | – | Yes |
| Network Monitoring | – | Yes |

### Core features

**Mercury**

No features listed.

**Viettel VCS-NSM**

10 features listed. Sign in on the page to see them.

### Integrations

**Mercury**

No integrations listed.

**Viettel VCS-NSM**

1 integration listed. Sign in on the page to see them.

## Which one fits you

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

- [Mercury](https://cybersectools.com/tools/mercury) fits if you need a free product and you want an open-source product.
- [Viettel VCS-NSM](https://cybersectools.com/tools/viettel-vcs-nsm) fits if you are a small business.

## Mercury vs Viettel VCS-NSM FAQ

Common questions when comparing Mercury vs Viettel VCS-NSM for network detection and response.

### What is the difference between Mercury and Viettel VCS-NSM?

**Mercury**: Network metadata capture and analysis tool.

**Viettel VCS-NSM**: Real-time network security monitoring for threat detection using DPI and sandbox. Built by Viettel Security.

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

### Who makes Mercury and Viettel VCS-NSM?

**Mercury** is open-source with 501 GitHub stars. **Viettel VCS-NSM** is made by Viettel Security. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Mercury a good alternative to Viettel VCS-NSM?

Often, yes. Mercury and Viettel VCS-NSM are both Network Detection and Response products, and both cover PCAP. Key differences: Mercury is Free while Viettel VCS-NSM is Commercial, Mercury is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Mercury vs Corelight Open NDR Platform](https://cybersectools.com/compare/corelight-open-ndr-platform-vs-mercury)
- [Mercury vs cPacket Unified Observability Platform](https://cybersectools.com/compare/cpacket-unified-observability-platform-vs-mercury)
- [Mercury vs Hyprfire Firebug](https://cybersectools.com/compare/hyprfire-firebug-vs-mercury)
- [Viettel VCS-NSM vs Corelight Open NDR Platform](https://cybersectools.com/compare/corelight-open-ndr-platform-vs-viettel-vcs-nsm)
- [Viettel VCS-NSM vs cPacket Unified Observability Platform](https://cybersectools.com/compare/cpacket-unified-observability-platform-vs-viettel-vcs-nsm)
- [Viettel VCS-NSM vs Hyprfire Firebug](https://cybersectools.com/compare/hyprfire-firebug-vs-viettel-vcs-nsm)

## Alternatives to each

- [See all Mercury alternatives](https://cybersectools.com/alternatives/mercury)
- [See all Viettel VCS-NSM alternatives](https://cybersectools.com/alternatives/viettel-vcs-nsm)

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Source: https://cybersectools.com/compare/mercury-vs-viettel-vcs-nsm

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More on Mercury and Viettel VCS-NSM: 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