CVE-2012-0021 Denial of service in n/a

What is CVE-2012-0021?

CVE-2012-0021 is a low-severity denial of service vulnerability in Apache Http Server, published on 28 Jan 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-20

Which versions are affected by CVE-2012-0021?

It affects 1 product.

Products include Apache Http Server.

How do I fix CVE-2012-0021?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2012-0021 being exploited?

There is no known exploitation of CVE-2012-0021 in the wild and no public exploit code.

Other vulnerabilities in Apache Http Server

• CVE-2021-42013 Apache HTTP Server Path Traversal Exploited Critical 9.8
• CVE-2024-38475 Apache HTTP Server Improper Escaping of Output Exploited Critical 9.1
• CVE-2021-40438 Apache HTTP Server-Side Request Forgery (SSRF) Exploited Critical 9.0
• CVE-2019-0211 Apache HTTP Server Privilege Escalation Exploited High 7.8
• CVE-2021-41773 Apache HTTP Server Path Traversal Exploited High 7.5

All Apache Http Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2012-0021, GHSA-mq76-p4cp-m2vg.