Security readout for executives and security teams
Plain-English summary
This is a denial-of-service risk in Apache HTTP Server when HTTP/2 is enabled. A client can keep a connection, server thread, and CPU time occupied by sending continuous large SETTINGS frames, potentially reducing availability for legitimate users.
Executive priority
Treat as a service-availability issue for Apache-hosted applications using HTTP/2. It is not presented as code execution, but exposed public sites could face resource exhaustion. Prioritize remediation where outages would affect customers or revenue.
Technical view
CVE-2018-11763 affects Apache HTTP Server 2.4.17 through 2.4.34 and only HTTP/2 connections. The issue allows resource exhaustion because large, repeated HTTP/2 SETTINGS frames can avoid normal connection timeout handling while consuming connection, thread, and CPU resources.
Likely exposure
Exposure is most likely on internet-facing or internal Apache HTTP Server deployments running versions 2.4.17 to 2.4.34 with the h2 protocol enabled. Deployments without HTTP/2 enabled are not described as affected by the CVE source.
Exploitation context
The source bundle does not identify active exploitation, public exploit use, or KEV listing. The described attack condition is remote client interaction over HTTP/2, causing service degradation rather than data theft or code execution.
Researcher notes
Key constraints are version range and HTTP/2 enablement. Evidence provided names one mitigation: not enabling h2. The bundle lacks CVSS, CWE, exploit telemetry, and exact fixed-version details, so validation should rely on Apache and distribution advisories.
Mitigation direction
- Check Apache and operating-system vendor advisories for fixed httpd packages.
- Disable the h2 protocol where HTTP/2 is not required.
- Prioritize internet-facing Apache servers before internal-only deployments.
- Account for vendor backports when assessing installed package versions.
Validation and detection
- Inventory Apache HTTP Server versions across web tiers and appliances.
- Confirm whether HTTP/2 h2 is enabled on each Apache deployment.
- Map versions 2.4.17 through 2.4.34 to vendor advisory status.
- Review monitoring for abnormal HTTP/2 connection, thread, or CPU pressure.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-11763 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlCVE reference · x_refsource_CONFIRM
- RHSA-2018:3558CVE reference · vendor-advisory, x_refsource_REDHAT
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_usCVE reference · x_refsource_CONFIRM
- https://security.netapp.com/advisory/ntap-20190204-0004/CVE reference · x_refsource_CONFIRM
- RHSA-2019:0367CVE reference · vendor-advisory, x_refsource_REDHAT
- USN-3783-1CVE reference · vendor-advisory, x_refsource_UBUNTU
- https://httpd.apache.org/security/vulnerabilities_24.htmlCVE reference · x_refsource_CONFIRM
- RHSA-2019:0366CVE reference · vendor-advisory, x_refsource_REDHAT
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlCVE reference · x_refsource_MISC
- [httpd-cvs] 20190815 svn commit: r1048743 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlCVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20190815 svn commit: r1048742 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlCVE reference · mailing-list, x_refsource_MLIST
- https://www.tenable.com/security/tns-2019-09CVE reference · x_refsource_CONFIRM
- [httpd-cvs] 20200401 svn commit: r1058586 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlCVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20200401 svn commit: r1058587 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlCVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073140 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlCVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073139 [11/13] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1888194 [11/13] - /httpd/site/trunk/content/security/json/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210330 svn commit: r1073149 [11/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/CVE reference · mailing-list, x_refsource_MLIST
- [httpd-cvs] 20210606 svn commit: r1075470 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlCVE reference · mailing-list, x_refsource_MLIST
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.