Is CVE-2013-5704 being actively exploited?

CVE-2013-5704 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2013-5704?

CVE-2013-5704 has a CVSS 2.0 base score of 5.0 (MEDIUM).

CVE-2013-5704

MEDIUM · CVSS 5.0EPSS 58.0%EU EUVD

The mod_headers module in the Apache HTTP Server 2.2.22 allows remote attackers to bypass "RequestHeader unset" directives by placing a header in the trailer portion of data sent with chunked transfer coding. NOTE: the vendor states "this is not a security issue in httpd as such."

Key facts

CVSS score: 5.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:L/Au:N/C:N/I:P/A:N
EPSS score: 58.0% (99th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2013-5541)
Published: April 15, 2014
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2013-5541 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apache / http server
apple / mac os x
apple / mac os x server
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
oracle / enterprise manager ops center
oracle / enterprise manager ops center
oracle / enterprise manager ops center
oracle / enterprise manager ops center
oracle / enterprise manager ops center
oracle / http server
oracle / http server
oracle / http server
oracle / http server
oracle / linux

and 24 more…

Certified products that may be affected

9 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Oracle Linux 7 Unbreakable Enterprise Kernel (UEK 6) Cryptographic Module - Oracle Corporation - FIPS 140 4169 - historical
Red Hat Enterprise Linux 7.6 - Red Hat, Inc. - Common Criteria CCEVS-VR-VID-11039-2020 - archived
Oracle Linux 6 Kernel Crypto API Cryptographic Module - Oracle Corporation - FIPS 140 3421 - historical
Oracle Linux 6 Libreswan Cryptographic Module - Oracle Corporation - FIPS 140 3170 - historical
Oracle Linux 6 NSS Cryptographic Module - Oracle Corporation - FIPS 140 3111 - historical

See all 9 in the Security Certifications Explorer.

References

http://lists.apple.com/archives/security-announce/2015/Apr/msg00001.html(Mailing List, Third Party Advisory)
http://lists.apple.com/archives/security-announce/2015/Sep/msg00004.html(Mailing List, Third Party Advisory)
http://marc.info/?l=apache-httpd-dev&m=139636309822854&w=2(Mailing List, Third Party Advisory)
http://marc.info/?l=bugtraq&m=143403519711434&w=2(Issue Tracking, Mailing List, Third Party Advisory)
http://marc.info/?l=bugtraq&m=144493176821532&w=2(Issue Tracking, Mailing List, Third Party Advisory)
http://martin.swende.se/blog/HTTPChunked.html(Broken Link, Exploit, Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2015-0325.html(Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2015-1249.html(Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2015-2661.html(Broken Link, Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2016-0061.html(Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2016-0062.html(Third Party Advisory)
http://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x/CHANGES(Release Notes, Vendor Advisory)
http://svn.apache.org/viewvc/httpd/httpd/trunk/modules/proxy/mod_proxy_http.c(Patch, Vendor Advisory)
http://svn.apache.org/viewvc/httpd/httpd/trunk/modules/proxy/mod_proxy_http.c?r1=1610674&r2=1610814&diff_format=h(Patch, Vendor Advisory)
http://www.mandriva.com/security/advisories?name=MDVSA-2014:174(Third Party Advisory)
http://www.oracle.com/technetwork/topics/security/bulletinjan2015-2370101.html(Third Party Advisory)
http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html(Third Party Advisory)
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html(Third Party Advisory)
http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html(Third Party Advisory)
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html(Third Party Advisory)
http://www.securityfocus.com/bid/66550(Third Party Advisory, VDB Entry)
http://www.ubuntu.com/usn/USN-2523-1(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2015:2659(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2015:2660(Third Party Advisory)
https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04832246(Third Party Advisory)
https://httpd.apache.org/security/vulnerabilities_24.html(Vendor Advisory)
https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r83109088737656fa6307bd99ab40f8ff0269ae58d3f7272d7048494a%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9821b0a32a1d0a1b4947abb6f3630053fcbb2ec905d9a32c2bd4d4ee%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/ra7f6aeb28661fbf826969526585f16856abc4615877875f9d3b35ef4%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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