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CVE-2024-27316

HighPublished

Apache HTTP Server: HTTP/2 DoS by memory exhaustion on endless continuation frames

Published: Apr 4, 2024
Updated: Nov 4, 2025
Assigning CNA: apache
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

91.3%

High · next 30 days

Percentile: 99.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.

Sources

CVE-2024-27316PoC
Proof of concept (PoC) for CVE-2024-27316 (tested), CVE-2024-30255 (untested), CVE-2024-31309 (untested), CVE-2024-28182 (untested), CVE-2024-2653 (untested) and CVE-2024-27919 (untested)
CVE-2024-27316_pocPoC
Proof-of-concept exploit for CVE-2024-27316, an HTTP/2 CONTINUATION flood vulnerability in Apache httpd, demonstrating resource exhaustion via crafted requests.

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