Description
While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing, allowing an external source to DoS the server. This requires a specially crafted request. The vulnerability was recently introduced in version 2.4.49. No exploit is known to the project.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apache2 | 2.4.50-1 | — |
| Debian 13 | apache2 | 2.4.50-1 | — |
| Debian 12 | apache2 | 2.4.50-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.51-28.el7jbcs | RHSA-2022:7143 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.51-28.el7jbcs | RHSA-2022:7143 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.50-r0 | — |
| Alpine v3.23 | apache2 | 2.4.50-r0 | — |
| Alpine v3.22 | apache2 | 2.4.50-r0 | — |
| Alpine v3.21 | apache2 | 2.4.50-r0 | — |
| Alpine v3.20 | apache2 | 2.4.50-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.50-r0 | — |
| Alpine v3.18 | apache2 | 2.4.50-r0 | — |
| Alpine v3.17 | apache2 | 2.4.50-r0 | — |
| Alpine v3.16 | apache2 | 2.4.50-r0 | — |
| Alpine v3.15 | apache2 | 2.4.50-r0 | — |
| Alpine v3.14 | apache2 | 2.4.50-r0 | — |
| Alpine v3.13 | apache2 | 2.4.50-r0 | — |
| Alpine v3.12 | apache2 | 2.4.50-r0 | — |
| Alpine v3.11 | apache2 | 2.4.50-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | httpd +7 | 2.4.51-1.amzn2 | ALAS2-2021-1716 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.51-1.amzn2 | ALAS2-2021-1716 |
Advisories 3
- RHSA-2022:7143 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.51 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- ALAS2-2021-1716 Important: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 15, 2021
References
- https://httpd.apache.org/security/vulnerabilities_24.html
- [oss-security] 20211005 CVE-2021-41524: Apache HTTP Server: null pointer dereference in h2 fuzzing mailing-list
- FEDORA-2021-5d2d4b6ac5 vendor-advisory
- 20211007 Apache HTTP Server Vulnerabilties: October 2021 vendor-advisory
- FEDORA-2021-f94985afca vendor-advisory
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://security.netapp.com/advisory/ntap-20211029-0009/
- GLSA-202208-20 vendor-advisory