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CVE-2016-8740

HighPublished

The mod_http2 module in the Apache HTTP Server 2.4.17 through 2.4.23, when the Protocols configuration includes h2 or h2c, does not restrict request-header...

Published: Dec 5, 2016
Updated: Aug 6, 2024
Assigning CNA: apache
Evidence observed: Dec 12, 2016

Primary CVSS

7.5/ 10High

nvd · CVSS 3.0

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

77.0%

High · next 30 days

Percentile: 99.5%
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

The mod_http2 module in the Apache HTTP Server 2.4.17 through 2.4.23, when the Protocols configuration includes h2 or h2c, does not restrict request-header length, which allows remote attackers to cause a denial of service (memory consumption) via crafted CONTINUATION frames in an HTTP/2 request.

Sources

apachedosExploit
An implementation of CVE-2016-8740
Apache 2.4.23 mod_http2 - Denial of ServiceExploit
Jungun Baek · linux · Dec 12, 2016

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