CVE-2016-8740

Public Exploit

Description

The 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.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 71.55% Top 5%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory gentoo.org
Affected: Apache Software Foundation Apache HTTP Server
Published at:
Updated at:

References

Link Tags
https://support.apple.com/HT208221
https://github.com/apache/httpd/commit/29c63b786ae028d82405421585e91283c8fa0da3 issue tracking third party advisory patch
http://www.securitytracker.com/id/1037388 vdb entry third party advisory
http://packetstormsecurity.com/files/140023/Apache-HTTPD-Web-Server-2.4.23-Memory-Exhaustion.html exploit vdb entry third party advisory
https://access.redhat.com/errata/RHSA-2017:1413 vendor advisory
https://access.redhat.com/errata/RHSA-2017:1161 vendor advisory
https://www.tenable.com/security/tns-2017-04
https://access.redhat.com/errata/RHSA-2017:1414 vendor advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03725en_us
https://www.exploit-db.com/exploits/40909/ exploit vdb entry third party advisory
http://rhn.redhat.com/errata/RHSA-2017-1415.html vendor advisory
http://www.securityfocus.com/bid/94650 vdb entry third party advisory
https://security.gentoo.org/glsa/201701-36 vendor advisory
https://security.netapp.com/advisory/ntap-20180423-0001/
https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E mailing list
https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E mailing list
https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E mailing list
https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E mailing list
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https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E mailing list
https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3E mailing list
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Frequently Asked Questions

What is the severity of CVE-2016-8740?
CVE-2016-8740 has been scored as a high severity vulnerability.
How to fix CVE-2016-8740?
To fix CVE-2016-8740, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-8740 being actively exploited in the wild?
It is possible that CVE-2016-8740 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~72% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2016-8740?
CVE-2016-8740 affects Apache Software Foundation Apache HTTP Server.
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