Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Http Server | 2.4.17 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/140023/Apache-HTTPD-Web-Server-2.4.23-MemorExploitThird Party AdvisoryVDB Entry
- http://rhn.redhat.com/errata/RHSA-2017-1415.html
- http://www.securityfocus.com/bid/94650Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037388Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:1161
- https://access.redhat.com/errata/RHSA-2017:1413
- https://access.redhat.com/errata/RHSA-2017:1414
- https://github.com/apache/httpd/commit/29c63b786ae028d82405421585e91283c8fa0da3Issue TrackingPatchThird Party Advisory
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na
- https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cd
- https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e10
- https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7
- https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76f
- https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37
- https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f8
FAQ
What is CVE-2016-8740?
CVE-2016-8740 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 cau...
How severe is CVE-2016-8740?
CVE-2016-8740 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-8740?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Http Server.