CVE-2016-8740
httpd: Incomplete handling of LimitRequestFields directive in mod_http2
Severity
LowRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · December 4, 2016
Updated · September 21, 2026
Description
A vulnerability was found in httpd's handling of the LimitRequestFields directive in mod_http2, affecting servers with HTTP/2 enabled. An attacker could send crafted requests with headers larger than the server's available memory, causing httpd to crash.
Statement
Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
As a temporary workaround - HTTP/2 can be disabled by changing the configuration by removing h2 and h2c from the Protocols line(s) in the configuration file.
The resulting line should read:
Protocols http/1.1
CVSS / CWE
CVSS 3.0 · 5.9CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 · 4.3AV:N/AC:M/Au:N/C:N/I:N/A:P
CWE-770 · Allocation of Resources Without Limits or Throttling