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Servers and applications

CVE-2012-4557

The mod_proxy_ajp module in the Apache HTTP Server 2.2.12 through 2.2.21 places a worker node into an error state upon detection of a long request-processing time, which allows remote attackers to cause a denial of service (worker consumption) via an expensive request.

Severity
Medium 5.0
Published
30 Nov 2012
Last changed
16 Jun 2026
Added to UpHeron
17 Oct 2026
Exploit chance
17% in the next 30 daysHigher than 97% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
CWE-399
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
Apache HTTP ServerServers and applications · cpe:a:apache:http_server
  • Version 2.2.21
  • Version 2.2.20
  • Version 2.2.19
  • Version 2.2.18
All 10 release lines
  • Version 2.2.12
  • Version 2.2.13
  • Version 2.2.14
  • Version 2.2.15
  • Version 2.2.16
  • Version 2.2.17
  • Version 2.2.18
  • Version 2.2.19
  • Version 2.2.20
  • Version 2.2.21

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2012-4557
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2012-4557