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CVE-2012-0021

2.6 · LOW

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,…

Published Jan 28, 2012apacheCWE-20EPSS 30.34%

Overview

CVE-2012-0021 is a low-severity vulnerability affecting apache http_server. It was published on January 28, 2012 and has a CVSS 2.0 base score of 2.6 (LOW).

This vulnerability has a CVSS 2.0 base score of 2.6, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from apache. Update http_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refh20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041Refhttpd.apache.org/security/vulnerabilities_22.htmlReflists.apple.com/archives/security-announce/2012/Sep/msg00004.htmlRefmarc.info/?l=bugtraq&m=133294460209056&w=2Refmarc.info/?l=bugtraq&m=133494237717847&w=2Refrhn.redhat.com/errata/RHSA-2012-0542.htmlRefrhn.redhat.com/errata/RHSA-2012-0543.htmlRefsecunia.com/advisories/48551Refsupport.apple.com/kb/HT5501Refsvn.apache.org/viewvc?view=revision&revision=1227292

How CyberStrike helps

Frequently asked questions

What is CVE-2012-0021?

CVE-2012-0021 is a low-severity vulnerability affecting apache http_server. It was published on January 28, 2012 and has a CVSS 2.0 base score of 2.6 (LOW).

How severe is CVE-2012-0021?

This vulnerability has a CVSS 2.0 base score of 2.6, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2012-0021?

Check the references section for vendor advisories and patches from apache. Update http_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2012-0021?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2012-0021 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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