CVE-2021-41524: null pointer dereference in h2 fuzzing
First published: Tue Oct 05 2021(Updated: )
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.
Credit: security@apache.org security@apache.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/jbcs-httpd24-httpd | <0:2.4.51-28.el8 | 0:2.4.51-28.el8 |
| redhat/jbcs-httpd24-httpd | <0:2.4.51-28.el7 | 0:2.4.51-28.el7 |
| Apache HTTP server | =2.4.49 | |
| Fedoraproject Fedora | =34 | |
| Fedoraproject Fedora | =35 | |
| Oracle Instantis Enterprisetrack | =17.1 | |
| Oracle Instantis Enterprisetrack | =17.2 | |
| Oracle Instantis Enterprisetrack | =17.3 | |
| Netapp Cloud Backup | ||
| redhat/httpd | <2.4.50 | 2.4.50 |
| =2.4.49 | ||
| =34 | ||
| =35 | ||
| =17.1 | ||
| =17.2 | ||
| =17.3 | ||
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-41524 https://nvd.nist.gov/vuln/detail/CVE-2021-41524 https://httpd.apache.org/security/vulnerabilities_24.html
- https://bugzilla.redhat.com/show_bug.cgi?id=2010934
- https://access.redhat.com/errata/RHSA-2022:7143
- https://access.redhat.com/errata/RHSA-2022:7144
- https://access.redhat.com/security/cve/cve-2021-41524
- http://www.openwall.com/lists/oss-security/2021/10/05/1
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
- https://security.gentoo.org/glsa/202208-20
- https://security.netapp.com/advisory/ntap-20211029-0009/
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://lists.apache.org/thread.html/rc30f96fa07346fa6bdd73f3e172b8964ec9a7d49351b4f60422fc469@%3Cannounce.apache.org%3E
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2010935
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
Frequently Asked Questions
What is CVE-2021-41524?
CVE-2021-41524 is a null pointer dereference vulnerability in the 2.4.49 version of httpd.
What is the severity of CVE-2021-41524?
CVE-2021-41524 has a severity rating of 7.5 (High).
How does CVE-2021-41524 affect the server?
CVE-2021-41524 allows an external source to cause a Denial of Service (DoS) on the server by sending a specially crafted request.
Which versions of httpd are affected by CVE-2021-41524?
CVE-2021-41524 affects version 2.4.49 of httpd.
How can I fix CVE-2021-41524?
To fix CVE-2021-41524, you should update httpd to version 2.4.50 or higher.
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