HTTP Response Splitting

Definitions

1. HTTP Response Splitting is an attack technique in which an adversary injects header delimiters so one response becomes multiple attacker-influenced responses. Defenders analyze it to understand prerequisites, affected trust boundaries, and likely telemetry, then reduce risk with layered controls such as validation, hardening, rate limits, segmentation, and high-quality logging for investigation and response.

   In plain English: HTTP Response Splitting is a way attackers abuse systems or trust relationships, and defenders counter it with better design, validation, monitoring, and layered controls.

   Example: "During the assessment, the team simulated HTTP Response Splitting against a staging service, confirmed the weakness with logs and telemetry, and then added tighter validation, safer defaults, and monitoring so the same technique would trigger an alert in production."

Related Terms

• Authentication
• OTP
• CAPTCHA Bypass
• Cookie Poisoning
• HTTP Parameter Pollution
• HTTP Request Smuggling
• HTTPS Stripping
• Open Redirect