Description
Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a security regression compared to the versions shipped in Red Hat Enterprise Linux 8.4. A user who installs or updates to Red Hat Enterprise Linux 8.5.0 would be vulnerable to the mentioned CVEs, even if they were properly fixed in Red Hat Enterprise Linux 8.4. CVE-2021-20325 was assigned to that Red Hat specific security regression and it does not affect the upstream versions of httpd.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | httpd | httpd 2.4.47, httpd 2.4.49 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | httpd +6 | 2.4.37-43.module+el8.5.0+13064+c4b14997 | RHSA-2021:4537 |
| RHEL 8 | mod_http2 | 1.15.7-3.module+el8.4.0+8625+d397f3da | RHSA-2021:4537 |
| RHEL 8 | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2021:4537 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-43.module+el8.5.0+13064+c4b14997 | RHSA-2021:4537 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | httpd +6 | 2.4.37-43.module_el8.5.0+2597+c4b14997.alma | ALSA-2021:4537 |
| AlmaLinux 8 | mod_http2 | 1.15.7-3.module_el8.5.0+2609+b30d9eec | ALSA-2021:4537 |
| AlmaLinux 8 | mod_md | 1:2.0.8-8.module_el8.5.0+2609+b30d9eec | ALSA-2021:4537 |
| AlmaLinux 8 | mod_ssl +1 | 1:2.4.37-43.module_el8.5.0+2597+c4b14997.alma | ALSA-2021:4537 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | httpd | 2.4.37-43.module+el8.5.0+714+5ec56ee8 | RLSA-2021:4537 |
| Rocky Linux 8 | mod_http2 | 1.15.7-3.module+el8.4.0+553+7a69454b | RLSA-2021:4537 |
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.4.0+553+7a69454b | RLSA-2021:4537 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | httpd +6 | 2.4.37-43.0.1.module+el8.5.0+20426+404a9eb9 | ELSA-2021-4537 |
| Oracle Linux 8 | mod_http2 | 1.15.7-3.module+el8.4.0+20024+b87b2deb | ELSA-2021-4537 |
| Oracle Linux 8 | mod_md | 1:2.0.8-8.module+el8.3.0+7816+49791cfd | ELSA-2021-4537 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-43.0.1.module+el8.5.0+20426+404a9eb9 | ELSA-2021-4537 |
Advisories 6
- ALSA-2021:4537 Important: httpd:2.4 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:4537 Red Hat Security Advisory: httpd:2.4 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RLSA-2021:4537 Important: httpd:2.4 security update Rocky Linux Security Advisories · Feb 5, 2026
- WID-SEC-2022-0724 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 29, 2025
- WID-SEC-2022-0438 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 26, 2024
- ELSA-2021-4537 Important: httpd:2.4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 18, 2021