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Vulnerabilities

Vulnerability · CVE-2014-3581

The cache_merge_headers_out function in modules/cache/cache_util.c in the mod_cache module in the Apache HTTP Server before 2.4.11 allows remote attackers to cause a d…

Published Oct 10, 2014 · catalog updated Jun 17, 2026 · http server

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2014-3581 is not in CISA KEV. FIRST estimates a 13.45% chance of exploitation in the next 30 days. Check whether you run http server.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
13.45%
Remediation
Advisory link
Affected products
cpe apache/http server

The cache_merge_headers_out function in modules/cache/cache_util.c in the mod_cache module in the Apache HTTP Server before 2.4.11 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty HTTP Content-Type header.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apache/http server2.4.1
  • cpe apache/http server2.4.2
  • cpe apache/http server2.4.3
  • cpe apache/http server2.4.4
  • cpe apache/http server2.4.6
  • cpe apache/http server2.4.7

How to fix CVE-2014-3581

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2014-3581 is not in CISA KEV. FIRST estimates a 13.45% chance of exploitation in the next 30 days. Check whether you run http server.

Which versions are affected?

Compare what you have installed with apache/http server 2.4.1; apache/http server 2.4.2; apache/http server 2.4.3; apache/http server 2.4.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-476: NULL Pointer Dereference. EPSS 13.45%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Apache HTTP Server security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 10, 2014 · Monitored products — critical

    Detected

    The cache_merge_headers_out function in modules/cache/cache_util.c in the mod_cache module in the Apache HTTP Server before 2.4.11 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty HTTP Content-Type header.

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    The cache_merge_headers_out function in modules/cache/cache_util.c in the mod_cache module in the Apache HTTP Server before 2.4.11 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty HTTP Content-Type header.

Sources

  • CVE.orgVulnerability recordCVE-2014-3581

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2014-3581

    30-day exploitation probability 13.45%

    first.org
  • Monitored products — criticalVendor advisoryCVE-2014-3581

    The cache_merge_headers_out function in modules/cache/cache_util.c in the mod_cache module in the Apache HTTP Server before 2.4.11 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty HTTP Content-Type header.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 4, 2026