RHSA-2022:0143HighCVSS 9.8

Red Hat Security Advisory: httpd security update

Published
January 17, 2022
Last Modified
August 6, 2026

🔗 CVE IDs covered (4)

CVE-2021-26691 →CVE-2021-34798 →CVE-2021-39275 →CVE-2021-44790 →

📋 Description

CVE-2021-26691 — httpd: mod_session: Heap overflow via a crafted SessionHeader value CVE-2021-34798 — httpd: NULL pointer dereference via malformed requests CVE-2021-39275 — httpd: Out-of-bounds write in ap_escape_quotes() via malicious input CVE-2021-44790 — httpd: mod_lua: Possible buffer overflow when parsing multipart content

🎯 Affected products75

  • 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 Optional (v. 7)
  • Red Hat Enterprise Linux Workstation (v. 7)
  • Red Hat Enterprise Linux Workstation Optional (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.s390x as a component of Red Hat Enterprise Linux Server (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.src as a component of Red Hat Enterprise Linux Client Optional (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.src as a component of Red Hat Enterprise Linux ComputeNode Optional (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.src as a component of Red Hat Enterprise Linux Server (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.src as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux ComputeNode Optional (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • httpd-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.s390x as a component of Red Hat Enterprise Linux Server (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux ComputeNode Optional (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • httpd-debuginfo-0:2.4.6-97.el7_9.4.x86_64 as a component of Red Hat Enterprise Linux Workstation Optional (v. 7)
  • httpd-devel-0:2.4.6-97.el7_9.4.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • +45 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: Only configurations which use the "SessionEnv" directive (which is not widely used) are vulnerable to this flaw. SessionEnv is not enabled in default configuration of httpd package shipped with Red Hat Products. Workaround: Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: Disabling mod_lua and restarting httpd will mitigate this flaw. See https://access.redhat.com/articles/10649 for more information.

🔗 References (7)