No exploitation reportedFix available

CVE-2018-11763

No exploitation reported by the sources we read.

Published2018-09-25

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.

Timeline

dates in UTC

2018-09-2521:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-11763?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-11763?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Redhat enterprise linux

Branch	Affected	Fixed in	Source
6.0	= 6.0	no fix published	NVD
7.0	= 7.0	no fix published	NVD
7.4	= 7.4	no fix published	NVD
7.5	= 7.5	no fix published	NVD
7.6	= 7.6	no fix published	NVD

Oracle instantis enterprisetrack

Branch	Affected	Fixed in	Source
17.1	= 17.1	no fix published	NVD
17.2	= 17.2	no fix published	NVD
17.3	= 17.3	no fix published	NVD

Oracle hospitality guest access

Branch	Affected	Fixed in	Source
4.2	= 4.2.0	no fix published	NVD
4.2	= 4.2.1	no fix published	NVD

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2018-11763 Red Hat Product Security437 products fixed · 1 known affected
httpd: DoS for HTTP/2 connections by continuous SETTINGS frames
httpd.src as a component of Red Hat Mobile Application Platform 4
RHSA-2019:0367 Red Hat Product Security138 products fixed
Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 security update
RHSA-2019:0366 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP1 security update
RHSA-2018:3558 Red Hat Product Security298 products fixed
Red Hat Security Advisory: httpd24 security, bug fix, and enhancement update

Full record on NVD

Fix

Vendor fix Red Hat Product Security RHSA-2019:0367 · 138 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon will be restarted automatically.
Vendor fix Red Hat Product Security RHSA-2019:0366 · 1 productThe References section of this erratum contains a download link (you must log in to download the update). Before applying the update, back up your existing Red Hat JBoss Core Services installation (including all applications and configuration files).
No fix planned, says the vendor Red Hat Product Security CVE-2018-11763 · 1 productWill not fix

Advisories and patches

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.05.9read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
FIRST EPSSEPSS score50.8 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2018-09-25
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-11763?

Is CVE-2018-11763 actively exploited?

Active exploitation of CVE-2018-11763 has not been confirmed. Its EPSS score was 50.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-11763?

CVE-2018-11763 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

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