Description
A specially crafted HTTP request header could have crashed the Apache HTTP Server prior to version 2.4.30 due to an out of bound read while preparing data to be cached in shared memory. It could be used as a Denial of Service attack against users of mod_cache_socache. The vulnerability is considered as low risk since mod_cache_socache is not widely used, mod_cache_disk is not concerned by this vulnerability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.5 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 | — |
| Debian 9 | apache2 | 2.4.25-3+deb9u4 | DSA-4164-1 |
| Debian 8 | apache2 | 2.4.10-10+deb8u12 | DSA-4164-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | apache2 | 2.4.29-1ubuntu4.1 | USN-3627-2 |
| Ubuntu 16.04 LTS | apache2 | 2.4.18-2ubuntu3.8 | USN-3627-1 |
| Ubuntu 14.04 LTS | apache2 | 2.4.7-1ubuntu4.20 | USN-3627-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | httpd +5 | 2.4.6-95.el7 | RHSA-2020:3958 |
| RHEL 7 | mod_ssl +1 | 1:2.4.6-95.el7 | RHSA-2020:3958 |
| RHEL 3 | httpd24-curl +2 | 7.61.1-1.el6 | RHSA-2018:3558 |
| RHEL 3 | httpd24-httpd +5 | 2.4.34-7.el6 | RHSA-2018:3558 |
| RHEL 3 | httpd24-mod_md | 2.4.34-7.el7 | RHSA-2018:3558 |
| RHEL 3 | httpd24-mod_ssl +1 | 1:2.4.34-7.el6 | RHSA-2018:3558 |
| RHEL 3 | httpd24-nghttp2 +2 | 1.7.1-7.el6 | RHSA-2018:3558 |
Show 1 more (older releases, extended support, other products)Fewer releases
| 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 |
| SLES 12 SP1 | apache2 | 2.4.16-20.16.1 | SUSE-SU-2018:0879-1 |
| SLES 12 | apache2 | 2.4.10-14.31.1 | SUSE-SU-2018:0901-1 |
Show 5 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 |
| SLES for SAP 12 SP1 | apache2 | 2.4.16-20.16.1 | SUSE-SU-2018:0879-1 |
| SUSE OpenStack Cloud 7 | apache2 | 2.4.23-29.18.2 | SUSE-SU-2018:1161-1 |
| SUSE OpenStack Cloud 6 | apache2 | 2.4.16-20.16.1 | SUSE-SU-2018:0879-1 |
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 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | httpd +5 | 2.4.6-95.0.1.el7 | ELSA-2020-3958 |
| Oracle Linux 7 | mod_ssl +1 | 1:2.4.6-95.0.1.el7 | ELSA-2020-3958 |
Advisories 11
- RHSA-2020:3958 Red Hat Security Advisory: httpd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- 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
- RHSA-2018:3558 Red Hat Security Advisory: httpd24 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-3627-2 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3627-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4164-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:1161-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0879-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0901-1 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
- ELSA-2020-3958 Moderate: httpd security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
References
- USN-3627-1 vendor-advisory
- 103522 vdb-entry
- DSA-4164 vendor-advisory
- https://security.netapp.com/advisory/ntap-20180601-0004/
- RHSA-2018:3558 vendor-advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us
- RHSA-2019:0367 vendor-advisory
- USN-3627-2 vendor-advisory
- 1040572 vdb-entry
- https://httpd.apache.org/security/vulnerabilities_24.html
- [oss-security] 20180323 CVE-2018-1303: Possible out of bound read in mod_cache_socache mailing-list
- 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] 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