Researchers and vendors have disclosed a denial-of-service (DoS) vulnerability in HTTP/2 protocol. The vulnerability (CVE-2023-44487), known as Rapid Reset, has been exploited in the wild in August 2023 through October 2023.
CISA recommends organizations that provide HTTP/2 services apply patches when available and consider configuration changes and other mitigations discussed in the references below. For more information on Rapid Reset, see:
Organizations can take proactive steps to reduce the effects of DoS attacks. See the following guidance for more information:
- CISA: Understanding and Responding to Distributed Denial-of-Service Attacks
- CISA: Additional DDoS Guidance for Federal Agencies