CVE-2024-27316: Apache HTTP Server: HTTP/2 DoS by memory exhaustion on endless continuation frames

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 91.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-04 · updated 2026-06-17
Weakness: CWE-770

Description

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.

Affected products

Apache HTTP Server: from 2.4.17 before 2.4.59 — fixed in 2.4.59
Fedoraproject Fedora: 38, 39, 40
NetApp ONTAP 9: 9

How to fix

Upgrade to a fixed version: Apache HTTP Server 2.4.59. Check the vendor advisory for mitigations.

References

http://seclists.org/fulldisclosure/2024/Jul/18
http://www.openwall.com/lists/oss-security/2024/04/04/4
https://httpd.apache.org/security/vulnerabilities_24.html
https://support.apple.com/kb/HT214119
https://www.openwall.com/lists/oss-security/2024/04/03/16
http://seclists.org/fulldisclosure/2024/Jul/18
http://www.openwall.com/lists/oss-security/2024/04/04/4
https://httpd.apache.org/security/vulnerabilities_24.html
https://lists.debian.org/debian-lts-announce/2024/05/msg00013.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FO73U3SLBYFGIW2YKXOK7RI4D6DJSZ2B/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MIUBKSCJGPJ6M2U63V6BKFDF725ODLG7/
https://security.netapp.com/advisory/ntap-20240415-0013/

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