CVE-2013-5704

CVE-2013-5704 is a medium-severity vulnerability in Apache Http Server with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 60% places it in the 99th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

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."

Frequently asked questions

What is CVE-2013-5704?
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."
How severe is CVE-2013-5704?
CVE-2013-5704 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2013-5704 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 60% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-5704?
CVE-2013-5704 primarily affects Apache Http Server. In total, 71 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-5704?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-5704 published?
CVE-2013-5704 was published on 2014-04-15 and last updated on 2026-06-16.

References

Affected products (71)

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Threat intelligence

Threat-intel indicators referencing this CVE: