HOMEVULNERABILITIESCVE-2018-11763
MEDIUM

CVE-2018-11763

NVD-CWE-noinfoPublished: September 25, 2018· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2018-11763 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Apache1 product(s)
http server
Canonical1 product(s)
ubuntu linux
netapp1 product(s)
storage automation store
Oracle5 product(s)
enterprise manager ops centerhospitality guest accessinstantis enterprisetrackretail xstore point of servicesecure global desktop
Red Hat1 product(s)
enterprise linux
Source: NVD CPE · 17 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
PATCHhttps://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
PATCHhttps://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
PATCHhttps://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
ADVISORYhttp://www.securityfocus.com/bid/105414
ADVISORYhttp://www.securitytracker.com/id/1041713
ADVISORYhttps://access.redhat.com/errata/RHSA-2018:3558
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0366
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0367
ADVISORYhttps://httpd.apache.org/security/vulnerabilities_24.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20190204-0004/
ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us
ADVISORYhttps://usn.ubuntu.com/3783-1/
ADVISORYhttp://www.securityfocus.com/bid/105414
ADVISORYhttp://www.securitytracker.com/id/1041713
ADVISORYhttps://access.redhat.com/errata/RHSA-2018:3558
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0366
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0367
ADVISORYhttps://httpd.apache.org/security/vulnerabilities_24.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20190204-0004/
ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us
ADVISORYhttps://usn.ubuntu.com/3783-1/

All References (52)

→
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00030.html
→
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00056.html
→
http://www.securityfocus.com/bid/105414Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1041713Third Party Advisory · VDB Entry
→
https://access.redhat.com/errata/RHSA-2018:3558Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2019:0366Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2019:0367Third Party Advisory
→
https://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
→
https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E
→
https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E
→
https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E
→
https://lists.apache.org/thread.html/r15f9aa4427581a1aecb4063f1b4b983511ae1c9935e2a0a6876dad3c%40%3Ccvs.httpd.apache.org%3E
→
https://lists.apache.org/thread.html/r6521a7f62276340eabdb3339b2aa9a38c5f59d978497a1f794af53be%40%3Ccvs.httpd.apache.org%3E
→
https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E
→
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E

Quick Facts

CVE IDCVE-2018-11763
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected5 vendor(s)
PublishedSep 25, 2018

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CVE-2020-14701
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CVE-2021-2256
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-11763 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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