Skip to content
Fencer Vulns
medium 5.3

CVE-2020-11985 json

IP address spoofing when proxying using mod_remoteip and mod_rewrite For configurations using proxying with mod_remoteip and certain mod_re…

published 2020-08-07 6 y ago modified 2026-09-08 2 mo ago also BIT-apache-2020-11985 , EUVD-2020-4308

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.1%
EPSS 7.1% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami apache 2.4.24
  • apache2 Debian 14, Debian 13, Debian 12 2.4.25-1

debian advisories DEBIAN-CVE-2020-11985

  • apache2 Ubuntu 16.04 LTS 2.4.18-2ubuntu3.15

ubuntu advisories UBUNTU-CVE-2020-11985

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd RHEL 7 2.4.6-40.el7
  • mod_ssl RHEL 7 1:2.4.6-40.el7
  • mod_ldap RHEL 7 2.4.6-40.el7
  • httpd-tools RHEL 7 2.4.6-40.el7
  • mod_session RHEL 7 2.4.6-40.el7
  • httpd-manual RHEL 7 2.4.6-40.el7
  • mod_proxy_html RHEL 7 1:2.4.6-40.el7
  • httpd24-httpd RHEL 2 SOFTWARE_COLLECTIONS 2.4.25-9.el6

red hat advisories RHBA-2015:2194RHSA-2017:1161

  • apache2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 2.4.23-29.63.1

suse advisories SUSE-SU-2020:2450-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-11985 updated cvss 5.3

httpd: IP address spoofing when proxying using mod_remoteip and mod_rewrite

  • Red Hat JBoss Enterprise Web Server 2 jbcs-httpd24, jbcs-httpd24-runtime
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux Client Optional (v. 7) httpd 2.4.6-40.el7, mod_ssl 2.4.6-40.el7, mod_ldap 2.4.6-40.el7, httpd-tools 2.4.6-40.el7, mod_session 2.4.6-40.el7, httpd-manual 2.4.6-40.el7, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd 2.4.6-40.el7, mod_ssl 2.4.6-40.el7, mod_ldap 2.4.6-40.el7, httpd-tools 2.4.6-40.el7, mod_session 2.4.6-40.el7, httpd-manual 2.4.6-40.el7, +1 more Red Hat Enterprise Linux Server (v. 7) httpd 2.4.6-40.el7, mod_ssl 2.4.6-40.el7, httpd-tools 2.4.6-40.el7, httpd-manual 2.4.6-40.el7 Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap 2.4.6-40.el7, mod_session 2.4.6-40.el7, mod_proxy_html 2.4.6-40.el7 Red Hat Enterprise Linux Workstation (v. 7) httpd 2.4.6-40.el7, mod_ssl 2.4.6-40.el7, httpd-tools 2.4.6-40.el7, httpd-manual 2.4.6-40.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap 2.4.6-40.el7, mod_session 2.4.6-40.el7, mod_proxy_html 2.4.6-40.el7
    fixed: vendor fix RHBA-2015:2194
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-httpd 2.4.25-9.el6, httpd24-mod_ssl 2.4.25-9.el6, httpd24-mod_ldap 2.4.25-9.el6, httpd24-httpd-tools 2.4.25-9.el6, httpd24-mod_session 2.4.25-9.el6, httpd24-httpd-manual 2.4.25-9.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-httpd 2.4.25-9.el7, httpd24-mod_ssl 2.4.25-9.el7, httpd24-mod_ldap 2.4.25-9.el7, httpd24-httpd-tools 2.4.25-9.el7, httpd24-mod_session 2.4.25-9.el7, httpd24-httpd-manual 2.4.25-9.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) httpd24-httpd 2.4.25-9.el6, httpd24-mod_ssl 2.4.25-9.el6, httpd24-mod_ldap 2.4.25-9.el6, httpd24-httpd-tools 2.4.25-9.el6, httpd24-mod_session 2.4.25-9.el6, httpd24-httpd-manual 2.4.25-9.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3) httpd24-httpd 2.4.25-9.el7, httpd24-mod_ssl 2.4.25-9.el7, httpd24-mod_ldap 2.4.25-9.el7, httpd24-httpd-tools 2.4.25-9.el7, httpd24-mod_session 2.4.25-9.el7, httpd24-httpd-manual 2.4.25-9.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-httpd 2.4.25-9.el6, httpd24-mod_ssl 2.4.25-9.el6, httpd24-mod_ldap 2.4.25-9.el6, httpd24-httpd-tools 2.4.25-9.el6, httpd24-mod_session 2.4.25-9.el6, httpd24-httpd-manual 2.4.25-9.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-httpd 2.4.25-9.el7, httpd24-mod_ssl 2.4.25-9.el7, httpd24-mod_ldap 2.4.25-9.el7, httpd24-httpd-tools 2.4.25-9.el7, httpd24-mod_session 2.4.25-9.el7, httpd24-httpd-manual 2.4.25-9.el7, +1 more
    fixed: vendor fix RHSA-2017:1161
  • Red Hat Enterprise Linux 5 httpd Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 8 httpd, mod_md, mod_ssl, mod_ldap, mod_http2, httpd-tools, +4 more Red Hat JBoss Core Services jbcs-httpd24-httpd
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

7.08% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami apache
>=2.4.1, <2.4.24
2.4.24

Affected products

  • n/a Apache HTTP Server

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.