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Vulnerability record · CVE-2016-8743 · published 27 July 2017

CVE-2016-8743: Apache http server vulnerability

Apache · Http Server

Apache HTTP Server, in all releases prior to 2.2.32 and 2.4.25, was liberal in the whitespace accepted from requests and sent in response lines and headers. Accepting these different behaviors represented a security concern when httpd participates in any chain of proxies or interacts with back-end application servers, either through mod_proxy or using conventional CGI mechanisms, and may result in request smuggling, response splitting and cache pollution.

7.5 CVSS 3.1 High EPSS 13% · top 3.7%
7.5CVSS 3.1 base score, v2 5.0
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
11Affected product versions listed by NVD
80References
17 Jun 2026Last modified by NVD

Description

Apache HTTP Server, in all releases prior to 2.2.32 and 2.4.25, was liberal in the whitespace accepted from requests and sent in response lines and headers. Accepting these different behaviors represented a security concern when httpd participates in any chain of proxies or interacts with back-end application servers, either through mod_proxy or using conventional CGI mechanisms, and may result in request smuggling, response splitting and cache pollution.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

11 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://rhn.redhat.com/errata/RHSA-2017-1415.html Third Party Advisory
http://www.debian.org/security/2017/dsa-3796 Third Party Advisory
http://www.securityfocus.com/bid/95077 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037508 Broken LinkThird Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:0906 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1161 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1413 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1414 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1721 Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbmu03753en_us Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03725en_us Third Party Advisory
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2016-8743 Vendor Advisory
https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%
https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%
https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/r09b8a39d1262adbab5528eea73df1b1f93e919bf004ed5a843d9cad1%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/r4fe84db67fe9dc906c6185e58bbd9913f4356dd555a5c3db490694e5%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/r6521a7f62276340eabdb3339b2aa9a38c5f59d978497a1f794af53be%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/r94284b139540e5287ebdd3450682d3e3d187263dd6b75af8fa7d4890%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org
https://lists.apache.org/thread.html/rfcb6c7b9e7ca727a7eeeb5f13f89488a03981cfa0e7c3125f18fa239%40%3Ccvs.httpd.apache.org
https://security.gentoo.org/glsa/201701-36 PatchThird Party AdvisoryVDB Entry
https://security.netapp.com/advisory/ntap-20180423-0001/ Third Party Advisory
https://support.apple.com/HT208221 Third Party Advisory
https://www.tenable.com/security/tns-2017-04 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2016-8743), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.