Runtime Security vs Static Analysis: Why You Need Both
The security industry has long debated shift-left vs. shift-right. Static analysis (SAST, SCA, IaC scanning) catches vulnerabilities before deployment. Runtime security (eBPF monitoring, DAST, anomaly detection) catches threats in production. The truth is that each approach has blind spots that the other fills. Here is what each catches, what it misses, and why the answer is both.
What Static Analysis Catches
Static analysis examines source code, dependencies, and infrastructure definitions without running them. It catches entire categories of vulnerabilities at the earliest possible point — before code reaches production.
SAST — Code Vulnerabilities
- SQL injection
- Cross-site scripting (XSS)
- Command injection
- Path traversal
- Hardcoded secrets
- Insecure deserialization
SCA — Dependency Risks
- Known CVEs in packages
- Malicious packages
- License violations
- Outdated dependencies
- Transitive vulnerabilities
- Supply chain risks
IaC Scanning — Misconfigurations
- Public S3 buckets
- Open security groups
- Missing encryption
- Overprivileged IAM
- Disabled logging
- Default VPC usage
Container Scanning — Image Issues
- OS package CVEs
- Running as root
- Secrets in layers
- Outdated base images
- Missing HEALTHCHECK
- Exposed ports
What Runtime Security Catches
Runtime security monitors live systems to detect threats that only manifest when code is actually executing — zero-day exploits, credential misuse, anomalous behavior, and configuration drift.
Behavioral Anomalies
- Unauthorized binary execution
- Unexpected child processes
- Abnormal network connections
- Process behavior changes
Active Threats
- Privilege escalation attempts
- Lateral movement
- Data exfiltration
- Cryptomining activity
Configuration Drift
- Runtime config changes
- Manual console modifications
- Unauthorized file modifications
- Cron job tampering
Zero-Day Exploitation
- Novel exploit patterns
- Unknown vulnerability usage
- Fileless attacks
- Memory corruption exploits
Head-to-Head Comparison
| Dimension | Static Analysis | Runtime Security |
|---|---|---|
| When it runs | Before deployment (CI/CD) | After deployment (production) |
| What it analyzes | Source code, configs, deps | Live system behavior |
| Detection timing | Earliest possible (shift-left) | Real-time in production |
| False positive rate | Higher (no runtime context) | Lower (observes actual behavior) |
| Zero-day detection | No (needs known patterns) | Yes (behavioral anomalies) |
| Fix cost | Low (found early) | High (already in production) |
| Coverage | Code you wrote/imported | Everything running |
| Setup complexity | Low (add to CI) | Medium (agent deployment) |
| Performance impact | None (runs in CI) | Low (<3% with eBPF) |
The Unified Approach: Code-to-Cloud Security
The most effective security posture combines both approaches. Static analysis catches known vulnerability patterns early and cheaply. Runtime security catches novel threats, configuration drift, and behavioral anomalies in production. Together, they create defense in depth across the entire software lifecycle.
Code
SAST + SCA
Build
Container + IaC
Deploy
CSPM + DAST
Runtime
eBPF Monitoring
Get Full Lifecycle Security with TigerGate
TigerGate is the code-to-cloud security platform that combines static analysis (SAST, SCA, IaC) with runtime security (eBPF monitoring, DAST, CSPM) in a single platform.