Description
IP address spoofing when proxying using mod_remoteip and mod_rewrite For configurations using proxying with mod_remoteip and certain mod_rewrite rules, an attacker could spoof their IP address for logging and PHP scripts. Note this issue was fixed in Apache HTTP Server 2.4.24 but was retrospectively allocated a low severity CVE in 2020.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Apache HTTP Server | 2.4.1 to 2.4.23 | — |
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 | 2.4.25-1 | — |
| Debian 13 | apache2 | 2.4.25-1 | — |
| Debian 12 | apache2 | 2.4.25-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | apache2 | 2.4.18-2ubuntu3.15 | — |
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 7 | httpd +5 | 2.4.6-40.el7 | RHBA-2015:2194 |
| RHEL 7 | mod_ssl +1 | 1:2.4.6-40.el7 | RHBA-2015:2194 |
| RHEL 2 | httpd24-httpd +5 | 2.4.25-9.el6 | RHSA-2017:1161 |
| RHEL 2 | httpd24-mod_ssl +1 | 1:2.4.25-9.el6 | RHSA-2017:1161 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SLES 12 SP4 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SLES 12 SP3 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SLES 12 SP2 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SLES for SAP 12 SP4 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SLES for SAP 12 SP3 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SLES for SAP 12 SP2 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SUSE OpenStack Cloud Crowbar 9 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SUSE OpenStack Cloud Crowbar 8 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SUSE OpenStack Cloud 9 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SUSE OpenStack Cloud 8 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SUSE OpenStack Cloud 7 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SUSE HPE Helion OpenStack 8 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
| SUSE Enterprise Storage 5 | apache2 | 2.4.23-29.63.1 | SUSE-SU-2020:2450-1 |
Advisories 4
- RHSA-2017:1161 Red Hat Security Advisory: httpd24-httpd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHBA-2015:2194 Red Hat Bug Fix Advisory: httpd bug fix and enhancement update Red Hat Security Advisories (RHSA) · Aug 4, 2026
- SUSE-SU-2020:2450-1 Security update for apache2 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-3319 Apache HTTP Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 31, 2024
References
- https://httpd.apache.org/security/vulnerabilities_24.html
- GLSA-202008-04 vendor-advisory
- FEDORA-2020-189a1e6c3e vendor-advisory
- FEDORA-2020-0d3d3f5072 vendor-advisory
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://security.netapp.com/advisory/ntap-20200827-0002/
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ 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 [12/13] - 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: r1073146 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html 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: r1075467 [2/2] - 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