UpHeron
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Servers and applications

CVE-2012-0021

The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a %{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value.

Severity
Low 2.6
Published
28 Jan 2012
Last changed
16 Jun 2026
Added to UpHeron
17 Oct 2026
Exploit chance
30% in the next 30 daysHigher than 98% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · Only under certain conditions · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:H/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 2.2.17
  • 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-2012-0021
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2012-0021