Horizon3

Stop testing what you already know

Most security teams are not short of vulnerability data. Scanners produce thousands of findings a month, pentests generate reports full of CVSS scores, and none of it tells you what an attacker could really do in your environment today. A critical-rated vulnerability sitting on an isolated test server is not the same risk as a medium-rated misconfiguration that opens a path to your domain controller. Traditional tools cannot tell the difference. That leaves security teams prioritising by severity score instead of by actual exposure, and reporting a risk picture that is already out of date by the time it reaches the board.

Horizon3 built NodeZero to answer a different question: not "what vulnerabilities exist" but "what can an attacker actually do here, right now." NodeZero autonomously executes real attack techniques, without agents and without disrupting your operations, pivoting through your network exactly as a human attacker would. It safely exploits what it finds, chains weaknesses together, and proves the impact with evidence rather than opinion.

The result is a continuous hack, fix, verify, repeat loop. NodeZero uncovers exploitable paths, prioritises them by business impact, hands your team detailed remediation guidance, and then lets you re-test with one click to confirm the fix actually worked. Run it once for a point-in-time assessment, or schedule it to run continuously, so your risk picture stays current every time your environment changes.

Solution

Autonomous Penetration Testing

Run unlimited, real-world attacks across internal networks, external perimeter, cloud, Kubernetes, Active Directory and web applications, without installing agents or taking systems offline.

Risk-Based Exposure Management

Cut through scanner noise and theoretical CVSS scores to prioritise the vulnerabilities, misconfigurations and exposed credentials that attackers can actually chain together to reach your most valuable assets.

Security Control Validation

Prove whether your EDR, identity controls and SOC detect and stop a genuine attack, rather than a simulated one, and use that evidence to tune your defences where it counts.

Why choose Horizon3?

From theoretical risk to proven exposure

Vulnerability scanners report what might be exploitable. Manual pentests are thorough but expensive, infrequent, and usually scoped to pre-production environments. Breach and attack simulation tools run scripted payloads against a sandbox. NodeZero is different: it executes genuine attack techniques safely in live production, learning from hundreds of thousands of autonomous tests run across its customer base, and it re-tests every fix with a single click so remediation is verified rather than assumed.

Built for proof, not promises

Horizon3 has earned the trust of some of the most security-conscious organisations in the world by demonstrating zero downtime across every production test it has run. That track record, combined with independent recognition, is why security and IT teams are moving from periodic, point-in-time testing to continuous validation with NodeZero.