RHSA-2021:3856HighCVSS 9.0

Red Hat Security Advisory: httpd security update

Published
October 14, 2021
Last Modified
August 8, 2026

🔗 CVE IDs covered (1)

CVE-2021-40438 →

📋 Description

CVE-2021-40438 — httpd: mod_proxy: SSRF via a crafted request uri-path containing "unix:"

🎯 Affected products200

  • Red Hat Enterprise Linux Client Optional (v. 7)
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7)
  • Red Hat Enterprise Linux Server (v. 7)
  • Red Hat Enterprise Linux Server AUS (v. 7.2)
  • Red Hat Enterprise Linux Server AUS (v. 7.3)
  • Red Hat Enterprise Linux Server AUS (v. 7.4)
  • Red Hat Enterprise Linux Server AUS (v. 7.6)
  • Red Hat Enterprise Linux Server AUS (v. 7.7)
  • Red Hat Enterprise Linux Server E4S (v. 7.6)
  • Red Hat Enterprise Linux Server E4S (v. 7.7)
  • Red Hat Enterprise Linux Server Optional (v. 7)
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.2)
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.3)
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.4)
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.6)
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.7)
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.6)
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.7)
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.6)
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.7)
  • Red Hat Enterprise Linux Server TUS (v. 7.6)
  • Red Hat Enterprise Linux Server TUS (v. 7.7)
  • Red Hat Enterprise Linux Workstation (v. 7)
  • Red Hat Enterprise Linux Workstation Optional (v. 7)
  • httpd-0:2.4.6-40.el7_2.7.src as a component of Red Hat Enterprise Linux Server AUS (v. 7.2)
  • httpd-0:2.4.6-40.el7_2.7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.2)
  • httpd-0:2.4.6-45.el7_3.6.src as a component of Red Hat Enterprise Linux Server AUS (v. 7.3)
  • httpd-0:2.4.6-45.el7_3.6.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.3)
  • httpd-0:2.4.6-67.el7_4.7.src as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • httpd-0:2.4.6-67.el7_4.7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.4)
  • +170 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon will be restarted automatically. Workaround: Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

🔗 References (4)