CVE-2021-40438

CISA description

A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.

Required action

Apply updates per vendor instructions.

Notes & references

• https://nvd.nist.gov/vuln/detail/CVE-2021-40438

Where this lands in 800-53

Vulnerability data triggers these controls during assessment and continuous monitoring.

• RA-5 · Vulnerability Monitoring and Scanning
• SI-2 · Flaw Remediation
• CM-6 · Configuration Settings
• SI-7 · Software, Firmware, and Information Integrity
• CM-8 · System Component Inventory

External lookups

• NVD · CVE-2021-40438
• CVE.org · CVE-2021-40438
• CISA KEV catalog (canonical)