CVE-2016-8740

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Summary

CVECVE-2016-8740
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-12-05 19:59:00 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionThe mod_http2 module in the Apache HTTP Server 2.4.17 through 2.4.23, when the Protocols configuration includes h2 or h2c, does not restrict request-header length, which allows remote attackers to cause a denial of service (memory consumption) via crafted CONTINUATION frames in an HTTP/2 request.

Risk And Classification

Primary CVSS: v3.0 7.5 HIGH from [email protected]

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.682590000 probability, percentile 0.986200000 (date 2026-05-10)

Problem Types: CWE-20 | CWE-399 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary7.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Apache Http Server 2.4.17 All All All
Application Apache Http Server 2.4.18 All All All
Application Apache Http Server 2.4.19 All All All
Application Apache Http Server 2.4.20 All All All
Application Apache Http Server 2.4.21 All All All
Application Apache Http Server 2.4.22 All All All
Application Apache Http Server 2.4.23 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache HTTP Server affected 2.4.17 - 2.4.23 Not specified

References

ReferenceSourceLinkTags
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
SECURITY: CVE-2016-8740 · apache/httpd@29c63b7 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Patch, Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Apache HTTPD HTTP/2 Header Processing Lets Remote Users Consume Excessive Memory Resources - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Third Party Advisory, VDB Entry
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Apache 2.4.23 (mod_http2) - Denial of Service af854a3a-2127-422b-91ae-364da2661108 www.exploit-db.com Exploit, Third Party Advisory, VDB Entry
[R5] SecurityCenter 5.4.3 Fixes Multiple Vulnerabilities - Security Advisory | Tenable Network Security af854a3a-2127-422b-91ae-364da2661108 www.tenable.com
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
About the security content of macOS High Sierra 10.13.1, Security Update 2017-001 Sierra, and Security Update 2017-004 El Capitan - Apple Support af854a3a-2127-422b-91ae-364da2661108 support.apple.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Document Display | HPE Support Center af854a3a-2127-422b-91ae-364da2661108 h20566.www2.hpe.com
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Apache HTTPD Web Server 2.4.23 Memory Exhaustion ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com Exploit, Third Party Advisory, VDB Entry
December 2016 Apache HTTP Server Vulnerabilities in Multiple NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
Apache: Multiple vulnerabilities (GLSA 201701-36) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Apache HTTP Server CVE-2016-8740 Denial of Service Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! MITRE lists.apache.org
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Pony Mail! MITRE lists.apache.org
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Legacy QID Mappings

  • 710461 Gentoo Linux Apache Multiple Vulnerabilities (GLSA 201701-36)
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