Description
When an HTTP/2 stream was destroyed after being handled, the Apache HTTP Server prior to version 2.4.30 could have written a NULL pointer potentially to an already freed memory. The memory pools maintained by the server make this vulnerability hard to trigger in usual configurations, the reporter and the team could not reproduce it outside debug builds, so it is classified as low risk.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.17 to 2.4.29 | — |
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 | 2.4.33-1 | — |
| Debian 13 | apache2 | 2.4.33-1 | — |
| Debian 12 | apache2 | 2.4.33-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | apache2 | 2.4.29-1ubuntu4.4 | USN-3783-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24 +1 | 1-6.jbcs.el6 | RHSA-2019:0367 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apache-commons-daemon-jsvc | 1:1.1.0-3.redhat_2.jbcs.el6 | RHSA-2019:0367 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr +1 | 1.6.3-31.jbcs.el6 | RHSA-2019:0367 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr-util +8 | 1.6.1-24.jbcs.el6 | RHSA-2019:0367 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.29-35.jbcs.el6 | RHSA-2019:0367 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_cluster-native | 1.3.8-3.Final_redhat_2.jbcs.el6 | RHSA-2019:0367 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +2 | 1.2.46-1.redhat_1.jbcs.el6 | RHSA-2019:0367 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.29-35.jbcs.el6 | RHSA-2019:0367 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-nghttp2 +1 | 1.29.0-9.jbcs.el6 | RHSA-2019:0367 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.0.2n-14.jbcs.el6 | RHSA-2019:0367 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | apache2 | 2.4.23-29.18.2 | SUSE-SU-2018:1161-1 |
| SLES 12 SP2 | apache2 | 2.4.23-29.18.2 | SUSE-SU-2018:1161-2, SUSE-SU-2018:1161-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | apache2 | 2.4.23-29.18.2 | SUSE-SU-2018:1161-1 |
| SLES for SAP 12 SP2 | apache2 | 2.4.23-29.18.2 | SUSE-SU-2018:1161-1 |
| SUSE OpenStack Cloud 7 | apache2 | 2.4.23-29.18.2 | SUSE-SU-2018:1161-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.33-r0 | — |
| Alpine v3.23 | apache2 | 2.4.33-r0 | — |
| Alpine v3.22 | apache2 | 2.4.33-r0 | — |
| Alpine v3.21 | apache2 | 2.4.33-r0 | — |
| Alpine v3.20 | apache2 | 2.4.33-r0 | — |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.33-r0 | — |
| Alpine v3.18 | apache2 | 2.4.33-r0 | — |
| Alpine v3.17 | apache2 | 2.4.33-r0 | — |
| Alpine v3.16 | apache2 | 2.4.33-r0 | — |
| Alpine v3.15 | apache2 | 2.4.33-r0 | — |
| Alpine v3.14 | apache2 | 2.4.33-r0 | — |
| Alpine v3.13 | apache2 | 2.4.33-r0 | — |
| Alpine v3.12 | apache2 | 2.4.33-r0 | — |
| Alpine v3.11 | apache2 | 2.4.33-r0 | — |
| Alpine v3.10 | apache2 | 2.4.33-r0 | — |
| Alpine v3.9 | apache2 | 2.4.33-r0 | — |
| Alpine v3.8 | apache2 | 2.4.33-r0 | — |
| Alpine v3.7 | apache2 | 2.4.33-r0 | — |
| Alpine v3.6 | apache2 | 2.4.33-r0 | — |
| Alpine v3.5 | apache2 | 2.4.33-r0 | — |
| Alpine v3.4 | apache2 | 2.4.33-r0 | — |
Advisories 4
- RHSA-2019:0367 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-3783-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2018:1161-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1161-2 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://security.netapp.com/advisory/ntap-20180601-0004/
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us
- RHSA-2019:0367 vendor-advisory
- [oss-security] 20180323 CVE-2018-1302: Possible write of after free on HTTP/2 stream shutdown mailing-list
- 103528 vdb-entry
- 1040567 vdb-entry
- USN-3783-1 vendor-advisory
- https://httpd.apache.org/security/vulnerabilities_24.html
- RHSA-2019:0366 vendor-advisory
- [httpd-cvs] 20190815 svn commit: r1048743 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20190815 svn commit: r1048742 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- https://www.tenable.com/security/tns-2019-09
- [httpd-cvs] 20200401 svn commit: r1058586 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20200401 svn commit: r1058587 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073140 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.ht mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [11/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [11/13] - /httpd/site/trunk/content/security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [12/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210603 svn commit: r1075360 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list
- [httpd-cvs] 20210606 svn commit: r1075470 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list