Home / Vulnerabilities / CVE-2023-44487
HIGH SEVERITY
CVE-2023-44487 IETF · HTTP/2

HTTP/2 Rapid Reset Attack Vulnerability

Technical Severity

CVSS v3.1 Metrics

HIGH
7.5 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitation Likelihood

EPSS Prediction

94.40 %
Predictive Probability
Percentile Rank
100.0 th

Documented as more likely to be exploited than 100.0% of known CVEs.

Detection Date

Oct 10, 2023

Remediation Due

Oct 31, 2023

CISA Catalog Active

Threat Analysis

HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

External Intelligence

CISA

CISA Advisory

https://www.cisa.gov/news-events/alerts/2023/10/10/http2-rapid-reset-vulnerability-cve-2023-44487

https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/

https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/
NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2023-44487