Description
In Apache HTTP Server 2.4.0 to 2.4.41, mod_proxy_ftp may use uninitialized memory when proxying to a malicious FTP server.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache | Apache HTTP Server | 2.4.0 to 2.4.41 | — |
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 | 2.4.43-1 | — |
| Debian 13 | apache2 | 2.4.43-1 | — |
| Debian 12 | apache2 | 2.4.43-1 | — |
| Debian 10 | apache2 | 2.4.38-3+deb10u4 | DSA-4757-1 |
| Debian 9 | apache2 | 2.4.25-3+deb9u10 | DLA-2706-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | apache2 | 2.4.41-4ubuntu3.1 | USN-4458-1 |
| Ubuntu 18.04 LTS | apache2 | 2.4.29-1ubuntu4.14 | USN-4458-1 |
| Ubuntu 16.04 LTS | apache2 | 2.4.18-2ubuntu3.17 | USN-4458-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | apache2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | httpd +6 | 2.4.37-30.module+el8.3.0+7001+0766b9e7 | RHSA-2020:4751 |
| RHEL 8 | mod_http2 | 1.15.7-2.module+el8.3.0+7670+8bf57d29 | RHSA-2020:4751 |
| RHEL 8 | mod_md | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2020:4751 |
| RHEL 8 | mod_ssl +1 | 1:2.4.37-30.module+el8.3.0+7001+0766b9e7 | RHSA-2020:4751 |
| 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 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24-curl +2 | 7.64.1-36.jbcs.el6 | RHSA-2020:2644 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.37-57.jbcs.el6 | RHSA-2020:2644 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_cluster-native | 1.3.14-4.Final_redhat_2.jbcs.el6 | RHSA-2020:2644 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 1.15.7-3.jbcs.el6 | RHSA-2020:2644 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +2 | 1.2.48-4.redhat_1.jbcs.el6 | RHSA-2020:2644 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_md | 1:2.0.8-24.jbcs.el6 | RHSA-2020:2644 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_security | 2.9.2-51.GA.jbcs.el6 | RHSA-2020:2644 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.37-57.jbcs.el6 | RHSA-2020:2644 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-nghttp2 +1 | 1.39.2-25.jbcs.el6 | RHSA-2020:2644 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl-pkcs11 | 0.4.10-7.jbcs.el7 | RHSA-2020:2644 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | mod_md | 1:2.0.8-8.module_el8.5.0+2609+b30d9eec | ALSA-2020:4751 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | mod_md | 1:2.0.8-8.module+el8.4.0+553+7a69454b | RLSA-2020:4751 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | apache2 | 2.4.33-3.30.1 | SUSE-SU-2020:1126-1 |
| SLES 15 | apache2 | 2.4.33-3.30.1 | SUSE-SU-2020:1126-1 |
| SLES 12 SP5 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SLES 12 SP4 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SLES 12 SP3 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SLES 12 SP1 | apache2 | 2.4.16-20.29.1 | SUSE-SU-2020:1111-1 |
| SLES 11 SP4 | apache2 | 2.2.34-70.27.1 | SUSE-SU-2020:14342-1 |
| SLES for SAP 15 | apache2 | 2.4.33-3.30.1 | SUSE-SU-2020:1126-1 |
| SLES for SAP 12 SP5 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SLES for SAP 12 SP4 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SLES for SAP 12 SP3 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SLES for SAP 12 SP2 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SLES for SAP 12 SP1 | apache2 | 2.4.16-20.29.1 | SUSE-SU-2020:1111-1 |
| SLE HPC 15 | apache2 | 2.4.33-3.30.1 | SUSE-SU-2020:1126-1 |
| SUSE OpenStack Cloud Crowbar 8 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SUSE OpenStack Cloud 8 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SUSE OpenStack Cloud 7 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | apache2 | 2.2.34-70.27.1 | SUSE-SU-2020:14342-1 |
| SUSE HPE Helion OpenStack 8 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
| SUSE Enterprise Storage 5 | apache2 | 2.4.23-29.54.1 | SUSE-SU-2020:1272-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | apache2 | 2.4.33-lp151.8.12.1 | openSUSE-SU-2020:0597-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.43-r0 | — |
| Alpine v3.23 | apache2 | 2.4.43-r0 | — |
| Alpine v3.22 | apache2 | 2.4.43-r0 | — |
| Alpine v3.21 | apache2 | 2.4.43-r0 | — |
| Alpine v3.20 | apache2 | 2.4.43-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.43-r0 | — |
| Alpine v3.18 | apache2 | 2.4.43-r0 | — |
| Alpine v3.17 | apache2 | 2.4.43-r0 | — |
| Alpine v3.16 | apache2 | 2.4.43-r0 | — |
| Alpine v3.15 | apache2 | 2.4.43-r0 | — |
| Alpine v3.14 | apache2 | 2.4.43-r0 | — |
| Alpine v3.13 | apache2 | 2.4.43-r0 | — |
| Alpine v3.12 | apache2 | 2.4.43-r0 | — |
| Alpine v3.11 | apache2 | 2.4.43-r0 | — |
| Alpine v3.10 | apache2 | 2.4.43-r0 | — |
| Alpine v3.9 | apache2 | 2.4.43-r0 | — |
| Alpine v3.8 | apache2 | 2.4.43-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | httpd +7 | 2.4.43-1.amzn2 | ALAS2-2020-1427 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.43-1.amzn2 | ALAS2-2020-1427 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | httpd +6 | 2.4.37-30.0.1.module+el8.3.0+7816+49791cfd | ELSA-2020-4751 |
| Oracle Linux 8 | mod_http2 | 1.15.7-2.module+el8.3.0+7816+49791cfd | ELSA-2020-4751 |
| Oracle Linux 8 | mod_md | 1:2.0.8-8.module+el8.3.0+7816+49791cfd | ELSA-2020-4751 |
| Oracle Linux 8 | mod_ssl +1 | 1:2.4.37-30.0.1.module+el8.3.0+7816+49791cfd | ELSA-2020-4751 |
| 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 18
- ALSA-2020:4751 Moderate: httpd:2.4 security, bug fix, and enhancement update AlmaLinux Security Advisories · Nov 2, 2026
- RHSA-2020:4751 Red Hat Security Advisory: httpd:2.4 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2020:3958 Red Hat Security Advisory: httpd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2020:2644 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP3 security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-4458-1 apache2 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4757-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2706-1 apache2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2020:4751 Moderate: httpd:2.4 security, bug fix, and enhancement update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2020:1111-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1126-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1272-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14342-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-0063 Juniper Junos Space: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 8, 2025
- openSUSE-SU-2020:0597-1 Security update for apache2 SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- ELSA-2020-4751 Moderate: httpd:2.4 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 10, 2020
- ELSA-2020-3958 Moderate: httpd security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
- ALAS2-2020-1427 Low: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 20, 2020
References
- [httpd-dev] 20200404 Odd vulnerabilities_24.html output mailing-list
- [httpd-dev] 20200404 Re: Odd vulnerabilities_24.html output mailing-list
- [httpd-cvs] 20200420 svn commit: r1876764 - /httpd/httpd/branches/2.4.x/CHANGES mailing-list
- openSUSE-SU-2020:0597 vendor-advisory
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://security.netapp.com/advisory/ntap-20200413-0002/
- USN-4458-1 vendor-advisory
- FEDORA-2020-189a1e6c3e vendor-advisory
- DSA-4757 vendor-advisory
- FEDORA-2020-0d3d3f5072 vendor-advisory
- [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: r1888194 [13/13] - /httpd/site/trunk/content/security/json/ 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 [13/13] - in /websites/staging/httpd/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 [13/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073157 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-1934.json security/vulnerabilities_24.html mailing-list
- [httpd-cvs] 20210330 svn commit: r1888213 - /httpd/site/trunk/content/security/json/CVE-2020-1934.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
- [debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security update mailing-list