CVE-2012-0021

Name: CVE-2012-0021
Creator: NVD / NIST
Published: 2012-01-28T04:05:00.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 30.81%

Last modified Jun 16, 2026

CVE-2012-0021 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 30.81% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

30.81%

98.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Apache	Http Server	2.2.17
Apache	Http Server	2.2.18
Apache	Http Server	2.2.19
Apache	Http Server	2.2.20
Apache	Http Server	2.2.21

References

Timeline

Published: Jan 28, 2012
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2012-0021?

How severe is CVE-2012-0021?

Severity scoring for CVE-2012-0021 is pending analysis. The EPSS model estimates a 30.81% probability of exploitation in the next 30 days.

How do I fix CVE-2012-0021?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2012-0021?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST