CVE-2015-3183
The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 74.4%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large chunk-size values and invalid chunk-extension characters in modules/http/http_filters.c.
- CVSS 2.0
- 5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N
- EPSS
- 74.39% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-17, CWE-20
- Affected
- apache/http server
- Source
- secalert@redhat.com
EPSS moved from 74.5% on 22 October 2026 to 74.4% on 4 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10735Third Party Advisory
- http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.htmlMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00004.htmlMailing List
- http://lists.opensuse.org/opensuse-updates/2015-10/msg00011.htmlThird Party Advisory
- http://marc.info/?l=bugtraq&m=144493176821532&w=2Mailing List, Third Party Advisory, VDB Entry
- http://rhn.redhat.com/errata/RHSA-2015-1666.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2015-1667.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2015-1668.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2015-2661.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-0061.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-0062.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2054.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2055.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2056.htmlThird Party Advisory
- http://www.apache.org/dist/httpd/CHANGES_2.4Vendor Advisory
- http://www.debian.org/security/2015/dsa-3325Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.htmlPatch
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.htmlMailing List, Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.htmlThird Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/75963Third Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/91787Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1032967Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-2686-1Third Party Advisory
- https://access.redhat.com/errata/RHSA-2015:2659Third Party Advisory
- https://access.redhat.com/errata/RHSA-2015:2660Third Party Advisory
- https://github.com/apache/httpd/commit/a6027e56924bb6227c1fdbf6f91e7e2438338be6Third Party Advisory
- https://github.com/apache/httpd/commit/e427c41257957b57036d5a549b260b6185d1dd73Third Party Advisory
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04832246Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.