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Fencer Intel
medium 6.1

CVE-2020-1927 json

In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by e…

published 6y ago modified 2mo ago also BIT-apache-2020-1927 , EUVD-2020-12745

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
56.7%
EPSS 56.7% chance of exploitation in 30 days, percentile 99%
public exploits
0
none known

Summary

In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within the request URL.

Patch / fix

  • bitnami apache 2.4.42
  • apache2 Debian 14, Debian 13, Debian 12 2.4.43-1

debian advisories DEBIAN-CVE-2020-1927

  • apache2 Ubuntu 16.04 LTS 2.4.18-2ubuntu3.17
  • apache2 Ubuntu 18.04 LTS 2.4.29-1ubuntu4.14
  • apache2 Ubuntu 20.04 LTS 2.4.41-4ubuntu3.1

ubuntu advisories UBUNTU-CVE-2020-1927

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 8 2.4.37-30.module+el8.3.0+7001+0766b9e7
  • mod_md RHEL 8 1:2.0.8-8.module+el8.3.0+6814+67d1e611
  • mod_ssl RHEL 8 1:2.4.37-30.module+el8.3.0+7001+0766b9e7
  • mod_ldap RHEL 8 2.4.37-30.module+el8.3.0+7001+0766b9e7
  • mod_http2 RHEL 8 1.15.7-2.module+el8.3.0+7670+8bf57d29
  • httpd-tools RHEL 8 2.4.37-30.module+el8.3.0+7001+0766b9e7
  • mod_session RHEL 8 2.4.37-30.module+el8.3.0+7001+0766b9e7
  • httpd-manual RHEL 8 2.4.37-30.module+el8.3.0+7001+0766b9e7

red hat advisories RHSA-2020:4751RHSA-2020:1337RHSA-2020:3958RHSA-2020:2263

  • apache2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +14 more 2.4.23-29.54.1
  • apache2 SLES for SAP 15, SLES 15-LTSS, SLE Module for Server Applications 15 SP1 +2 more 2.4.33-3.30.1
  • apache2 SLES for SAP 12 SP1, SLES 12 SP1-LTSS 2.4.16-20.29.1

suse advisories SUSE-SU-2020:1272-1SUSE-SU-2020:1126-1SUSE-SU-2020:1111-1

  • apache2 openSUSE Leap 15.1 2.4.33-lp151.8.12.1

opensuse advisories openSUSE-SU-2020:0597-1

  • mod_md AlmaLinux 8 1:2.0.8-8.module_el8.5.0+2609+b30d9eec
  • mod_md AlmaLinux 8 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa

almalinux advisories ALSA-2020:4751

  • mod_md Rocky Linux 8 1:2.0.8-8.module+el8.5.0+695+1fa8055e
  • mod_md Rocky Linux 8 1:2.0.8-8.module+el8.4.0+553+7a69454b

rocky linux advisories RLSA-2020:4751

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 2.4.43-r0

alpine advisories ALPINE-CVE-2020-1927

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • apache Arch Linux 2.4.43-1

arch linux advisories AVG-1126

Is CVE-2020-1927 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2020-1927 updated cvss 6.1

httpd: mod_rewrite configurations vulnerable to open redirect

  • Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP2
    fixed: vendor fix RHSA-2020:1336
  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-30.module+el8.3.0+7001+0766b9e7, mod_ssl 2.4.37-30.module+el8.3.0+7001+0766b9e7, mod_http2 1.15.7-2.module+el8.3.0+7670+8bf57d29, mod_ldap 2.4.37-30.module+el8.3.0+7001+0766b9e7, httpd-tools 2.4.37-30.module+el8.3.0+7001+0766b9e7, +4 more
    fixed: vendor fix RHSA-2020:4751
  • Red Hat Enterprise Linux Client Optional (v. 7) httpd 2.4.6-95.el7, mod_ssl 2.4.6-95.el7, mod_ldap 2.4.6-95.el7, httpd-tools 2.4.6-95.el7, mod_session 2.4.6-95.el7, httpd-manual 2.4.6-95.el7, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd 2.4.6-95.el7, mod_ssl 2.4.6-95.el7, mod_ldap 2.4.6-95.el7, httpd-tools 2.4.6-95.el7, mod_session 2.4.6-95.el7, httpd-manual 2.4.6-95.el7, +1 more Red Hat Enterprise Linux Server (v. 7) httpd 2.4.6-95.el7, mod_ssl 2.4.6-95.el7, httpd-tools 2.4.6-95.el7, mod_session 2.4.6-95.el7, httpd-manual 2.4.6-95.el7 Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap 2.4.6-95.el7, mod_proxy_html 2.4.6-95.el7 Red Hat Enterprise Linux Workstation (v. 7) httpd 2.4.6-95.el7, mod_ssl 2.4.6-95.el7, httpd-tools 2.4.6-95.el7, mod_session 2.4.6-95.el7, httpd-manual 2.4.6-95.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap 2.4.6-95.el7, mod_proxy_html 2.4.6-95.el7
    fixed: vendor fix RHSA-2020:3958
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-apr 1.6.3-86.jbcs.el6, jbcs-httpd24-brotli 1.0.6-21.jbcs.el6, jbcs-httpd24-httpd 2.4.37-52.jbcs.el6, jbcs-httpd24-mod_ssl 2.4.37-52.jbcs.el6, jbcs-httpd24-openssl 1.1.1c-16.jbcs.el6, jbcs-httpd24-mod_ldap 2.4.37-52.jbcs.el6, +9 more Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.6.3-86.jbcs.el7, jbcs-httpd24-brotli 1.0.6-21.jbcs.el7, jbcs-httpd24-httpd 2.4.37-52.jbcs.el7, jbcs-httpd24-mod_ssl 2.4.37-52.jbcs.el7, jbcs-httpd24-openssl 1.1.1c-16.jbcs.el7, jbcs-httpd24-mod_ldap 2.4.37-52.jbcs.el7, +9 more
    fixed: vendor fix RHSA-2020:1337
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-httpd 2.4.34-18.el6, httpd24-mod_ssl 2.4.34-18.el6, httpd24-mod_ldap 2.4.34-18.el6, httpd24-httpd-tools 2.4.34-18.el6, httpd24-mod_session 2.4.34-18.el6, httpd24-httpd-manual 2.4.34-18.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-mod_md 2.0.8-1.el7, httpd24-httpd 2.4.34-18.el7, httpd24-mod_ssl 2.4.34-18.el7, httpd24-mod_ldap 2.4.34-18.el7, httpd24-httpd-tools 2.4.34-18.el7, httpd24-mod_session 2.4.34-18.el7, +2 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) httpd24-mod_md 2.0.8-1.el7, httpd24-httpd 2.4.34-18.el7, httpd24-mod_ssl 2.4.34-18.el7, httpd24-mod_ldap 2.4.34-18.el7, httpd24-httpd-tools 2.4.34-18.el7, httpd24-mod_session 2.4.34-18.el7, +2 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) httpd24-mod_md 2.0.8-1.el7, httpd24-httpd 2.4.34-18.el7, httpd24-mod_ssl 2.4.34-18.el7, httpd24-mod_ldap 2.4.34-18.el7, httpd24-httpd-tools 2.4.34-18.el7, httpd24-mod_session 2.4.34-18.el7, +2 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-httpd 2.4.34-18.el6, httpd24-mod_ssl 2.4.34-18.el6, httpd24-mod_ldap 2.4.34-18.el6, httpd24-httpd-tools 2.4.34-18.el6, httpd24-mod_session 2.4.34-18.el6, httpd24-httpd-manual 2.4.34-18.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-mod_md 2.0.8-1.el7, httpd24-httpd 2.4.34-18.el7, httpd24-mod_ssl 2.4.34-18.el7, httpd24-mod_ldap 2.4.34-18.el7, httpd24-httpd-tools 2.4.34-18.el7, httpd24-mod_session 2.4.34-18.el7, +2 more
    fixed: vendor fix RHSA-2020:2263
  • Red Hat Enterprise Linux 5 httpd Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat JBoss Enterprise Web Server 2 jbcs-httpd24, jbcs-httpd24-runtime
    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

56.69% chance of exploitation in the next 30 days, higher than 99% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
OSV 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami apache
>=2.4.0, <2.4.42
2.4.42

Affected products

  • Apache Apache HTTP Server

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site
Technology feeds

References

Sources

Fencer Intel 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.