CVE-2018-11763
MEDIUM · CVSS 5.9EPSS 50.8%EU EUVD
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.
Key facts
- CVSS score
- 5.9 (v3.0)
- Severity
- MEDIUM
- CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H- EPSS score
- 50.8% (99th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2018-3778)
- Published
- September 25, 2018
- NVD last modified
- June 17, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2018-3778 in the EU Vulnerability Database. Last updated in EUVD on September 17, 2024.
View on the EU Vulnerability DatabaseAffected products
- apache / http server
- canonical / ubuntu linux
- netapp / storage automation store
- oracle / enterprise manager ops center
- oracle / hospitality guest access
- oracle / hospitality guest access
- oracle / instantis enterprisetrack
- oracle / instantis enterprisetrack
- oracle / instantis enterprisetrack
- oracle / retail xstore point of service
- oracle / retail xstore point of service
- oracle / secure global desktop
- redhat / enterprise linux
- redhat / enterprise linux
- redhat / enterprise linux
- redhat / enterprise linux
- redhat / enterprise linux
Certified products that may be affected
8 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Red Hat Enterprise Linux 7 NSS Cryptographic Module - Red Hat®, Inc. - FIPS 140 4498 - historical
- Red Hat Enterprise Linux 7 Kernel Crypto API Cryptographic Module - Red Hat®, Inc. - FIPS 140 3939 - historical
- Red Hat Enterprise Linux 7 OpenSSH Server Cryptographic Module - Red Hat®, Inc. - FIPS 140 3891 - historical
- Red Hat Enterprise Linux 7 OpenSSH Client Cryptographic Module - Red Hat®, Inc. - FIPS 140 3892 - historical
- Red Hat Enterprise Linux 7 OpenSSL Cryptographic Module - Red Hat®, Inc. - FIPS 140 3867 - historical
See all 8 in the Security Certifications Explorer.
References
- 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/105414(Third Party Advisory, VDB Entry)
- http://www.securitytracker.com/id/1041713(Third Party Advisory, VDB Entry)
- https://access.redhat.com/errata/RHSA-2018:3558(Third Party Advisory)
- https://access.redhat.com/errata/RHSA-2019:0366(Third Party Advisory)
- https://access.redhat.com/errata/RHSA-2019:0367(Third Party Advisory)
- https://httpd.apache.org/security/vulnerabilities_24.html(Vendor 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
- https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rfcf929bd33a6833e3f0c35eebdad70d5060665f9c4e17ea467c66770%40%3Ccvs.httpd.apache.org%3E
- https://security.netapp.com/advisory/ntap-20190204-0004/(Third Party Advisory)
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us(Third Party Advisory)
- https://usn.ubuntu.com/3783-1/(Third Party Advisory)
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html(Patch, Third Party Advisory)
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html(Patch, Third Party Advisory)
- https://www.tenable.com/security/tns-2019-09
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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