Bug bounty vs penetration testing vs DAST: what each one catches

The three tools, in plain terms

DAST (Dynamic Application Security Testing) is automated scanning of a running application. Tools like Burp Pro, Acunetix, OWASP ZAP. They run signature checks and fuzzing against your endpoints, looking for known vulnerability patterns.

Penetration testing is a scoped engagement, time-bounded, performed by humans or AI agents, with the goal of finding and proving exploitable issues in a target. The output is a structured report with reproducible findings.

Bug bounty is an open invitation to a community of independent researchers to find vulnerabilities, paid per finding. Continuous, broad, unstructured.

Same goal: find vulnerabilities. Different mechanics, different economics, different blind spots.

What each one catches well

DAST excels at:

• Known vulnerability classes with signature patterns (SQLi, basic XSS, outdated libraries).
• Low cost per scan (€2,000 to €10,000 a year for a tool).
• High frequency, low depth.

Pentest excels at:

• Logic flaws, chained vulnerabilities, real exploitation.
• Auth and authorization problems (IDOR, privilege escalation, broken object-level auth).
• Reasoned attack scenarios that DAST cannot construct.
• Producing audit-grade evidence.

Bug bounty excels at:

• Edge-case vulnerabilities discovered by sustained external attention.
• Surface that internal teams have grown blind to.
• Continuous discovery beyond engagement windows.

Where each one is weak

Tool	Blind spot
DAST	Anything requiring reasoning. Logic flaws. Multi-step attacks. Most authorization issues. False positive rate high enough to drown SOC teams.
Pentest (annual cadence)	Everything shipped to production after the engagement. Three to twelve months of silent exposure.
Bug bounty	Compliance evidence. Audit binders. Coverage guarantees. You pay for what is found, not what is tested.

A coherent stack for a 2026 SaaS

We see this combination working at clients:

1. DAST in CI. OWASP ZAP or Burp Pro inside the pipeline. Catches the obvious. Free or cheap.
2. Continuous AI pentest. Weekly rescan plus per-deploy on every web app, API, and external surface. €25,000 to €35,000 a year. Provides the audit evidence.
3. Annual human red team. AD, business logic, scenarios AI does not cover yet. €20,000 to €40,000.
4. Bug bounty (optional, year 2 and beyond). Once the AI pentest catches the volume, a bug bounty program captures the long tail. €10,000 to €50,000 a year depending on payout structure.

Most pre-Series B companies skip step 4. The first three are the foundation.

A common mistake

CISOs sometimes treat bug bounty as a substitute for pentest. It is not. Bug bounty does not produce DORA evidence, does not guarantee scope coverage, and rewards the most lucrative findings rather than the most strategically important ones. It is a complement, not a replacement.

The other common mistake: paying for DAST and calling it a pentest. The DAST report is a vulnerability scan output. An auditor under DORA or NIS2 increasingly distinguishes the two and asks for both.

DAST scans. Pentest proves. Bug bounty discovers. Three jobs, three tools.

How Fleuret fits

We are the continuous AI pentest layer. Pair us with DAST in CI and an annual human red team and you have a full offensive-security stack at a fraction of the historical cost.

If you are choosing between these tools or trying to understand how they fit, let's talk.

Related reading

• Automated vs manual pentesting: where each one wins, by surface and depth.
• Agentic AI pentesting explained: what makes agentic different from DAST and scanners.
• Pentest cost in Europe 2026: cost benchmark across bug bounty, pentest, and DAST.
• DORA pentest requirements 2026: why only pentest evidence passes audit.