What is CVE-2022-37436?

CVE-2022-37436 is a moderate severity vulnerability affecting Apache HTTP Server versions up to 2.4.55. This vulnerability allows a malicious backend to manipulate response headers, causing some headers to be incorporated into the response body instead of being interpreted by the client. Systems running affected versions that interact with malicious backends are at risk. Upgrading to version 2.4.56 or above mitigates this vulnerability.

Who is impacted by this

CVE-2022-37436 affects users of Apache HTTP Server versions up to 2.4.55. A malicious backend can manipulate response headers, causing some headers to be incorporated into the response body. This impacts the security of systems interacting with malicious backends. It is important to upgrade to a more secure version of Apache HTTP Server to address this vulnerability.

What to do if CVE-2022-37436 affected you

If you're affected by the CVE-2022-37436 vulnerability, it's crucial to take action to secure your system. Follow these simple steps:

1. Check your Apache HTTP Server version to see if it's affected (versions up to 2.4.55).

2. Upgrade to a secure version (2.4.56 or above) to mitigate the vulnerability.

3. Stay informed about security advisories and regularly update your software to avoid future vulnerabilities.

Is this in CISA’s Known Exploited Vulnerabilities Catalog?

The CVE-2022-37436 vulnerability is not listed in CISA's Known Exploited Vulnerabilities Catalog. This issue, affecting Apache HTTP Server versions up to 2.4.55, was published on January 17, 2023. There is no specific due date or required action mentioned, but upgrading to version 2.4.56 or later is recommended to mitigate the vulnerability.

Weakness Enumeration

The weakness enumeration for this vulnerability is categorized as CWE-436 (Interpretation Conflict) and CWE-113 (Improper Neutralization of CRLF Sequences in HTTP Headers).

Learn More

For a comprehensive understanding of this vulnerability, including its description, severity, technical details, and known affected software configurations, refer to the NVD page or the resources listed below.

• Apache HTTP Server 2.4 Vulnerabilities

• Gentoo Security - Apache HTTPD: Multiple Vulnerabilities (GLSA 202309-01)