Medium 5.0Published Apr 15, 2014

CVE-2013-5704The 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 transfe…

Updated under an hour ago (Nov 2, 2026, 12:20 AM ET)

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It affects apache http_server and 14 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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."

CVSS: 5.0 MEDIUM (v2.0, NVD)AV:N/AC:L/Au:N/C:N/I:P/A:N
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

apache http_server apache:http_server	2.2.0; 2.2.2; 2.2.3; 2.2.4; 2.2.5; 2.2.6; 2.2.8; 2.2.9; and 26 more ranges	NVD
redhat enterprise_linux_desktop redhat:enterprise_linux_desktop	6.0; 7.0	NVD
redhat enterprise_linux_eus redhat:enterprise_linux_eus	7.3; 7.4; 7.5; 7.6; 7.7	NVD
redhat enterprise_linux_server redhat:enterprise_linux_server	6.0; 7.0	NVD
redhat enterprise_linux_server_aus redhat:enterprise_linux_server_aus	7.3; 7.4; 7.6; 7.7	NVD
redhat enterprise_linux_server_tus redhat:enterprise_linux_server_tus	7.3; 7.6; 7.7	NVD
redhat enterprise_linux_workstation redhat:enterprise_linux_workstation	6.0; 7.0	NVD
redhat jboss_enterprise_web_server redhat:jboss_enterprise_web_server	3.0.0; 2.0.0	NVD
oracle enterprise_manager_ops_center oracle:enterprise_manager_ops_center	before 12.1.4; 12.1.4; 12.2.0; 12.2.1; 12.3.0	NVD
oracle http_server oracle:http_server	10.1.3.5.0; 11.1.1.7.0; 12.1.2.0; 12.1.3.0	NVD
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References

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
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.