DDoS and API Security Enhancement for Financial Institution

Cloudflare Enterprise · DDoS · API Security

A financial institution on Cloudflare Enterprise was still being taken offline by sustained DDoS attacks while its authentication APIs were being targeted by brute-force automation. The engagement used attack analysis, DDoS overrides, advanced rate limiting and API controls, then validated the configuration with live Nuclei attack simulation.

Documented project source

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Technical validation

No invented client identity

Documented engagement

Sustained DDoS attacks were taking the platform offline.

API authentication endpoints were being hammered by automated brute-force requests.

Cloudflare Enterprise was already deployed but the existing configuration was not handling the attack profile.

The team needed a way to test whether the changes actually worked under attack conditions.

Audited the Cloudflare Enterprise configuration and analyzed firewall and DDoS event logs.

Configured more aggressive DDoS override behavior for the observed attack signatures.

Ran a live Nuclei simulation; the first test showed the DDoS override alone was not sufficient.

Layered advanced rate limiting over the DDoS configuration for the exploited endpoints and request patterns.

Added dedicated API rate limiting, challenge responses and IP-based blocking for suspicious brute-force behavior.

Repeated the Nuclei simulation after the changes and confirmed the platform remained stable.

After 19 hours of configuration, testing and refinement, the platform remained stable during deliberate DDoS simulation.

DDoS traffic that had previously taken the site offline was mitigated.

API brute-force attacks were blocked at the Cloudflare edge.

The layered rate-limiting controls addressed a gap that DDoS settings alone did not solve.

The client confirmed the solution worked and left a five-star review highlighting expertise and clear guidance.

Used as part of the documented engagement.

Used as part of the documented engagement.

Used as part of the documented engagement.

Used as part of the documented engagement.

Used as part of the documented engagement.

Used as part of the documented engagement.

Used as part of the documented engagement.

Cloudflare security is most effective when controls are matched to the actual traffic and application architecture. The same principle applies to WordPress security: a WordPress security scan can identify issues, but remediation and hardening require a separate technical process.

This case study therefore connects naturally to Cloudflare DDoS protection, Cloudflare API security and Cloudflare WAF setup. For WordPress-specific issues, see WordPress malware removal services and WordPress security hardening.

Related services

Choose the service that matches the actual problem instead of combining every security control into one generic page.

This case study supports the related commercial services for Cloudflare security, WordPress security, click fraud prevention, and website security services, where relevant to the work described here.

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