Open redirect in Apache HTTP Server
Priority MEDIUM 61CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-601.
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.
Why it matters now
EPSS 0.56691 99th percentileScored 2026-11-07
Fix Fixed Red Hat: 5 advisories
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Apache | Apache HTTP Server | 2.4.0 to 2.4.41 | — | No fix listed | CNA |
- Apache HTTP Server VendorApache Affected 2.4.0 to 2.4.41 Fixed in — No fix listed CNA
CPE configurations NVD · 24
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* | 2.4.0 – 2.4.41 | Vulnerable | Apache |
| cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | 31 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* | 20.04 | Vulnerable | Canonical |
| cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* | 15.1 | Vulnerable | openSUSE |
| cpe:2.3:a:netapp:oncommand_unified_manager_core_package:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
- cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* Versions 2.4.0 – 2.4.41 Vulnerable ·Apache
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
- cpe:2.3:a:netapp:oncommand_unified_manager_core_package:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
Show 14 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:broadcom:brocade_fabric_operating_system:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Broadcom |
| cpe:2.3:a:oracle:communications_element_manager:8.1.1:*:*:*:*:*:*:* | 8.1.1 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:communications_element_manager:8.2.0:*:*:*:*:*:*:* | 8.2.0 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:communications_element_manager:8.2.1:*:*:*:*:*:*:* | 8.2.1 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:communications_session_report_manager:8.1.1:*:*:*:*:*:*:* | 8.1.1 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:communications_session_report_manager:8.2.0:*:*:*:*:*:*:* | 8.2.0 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:communications_session_report_manager:8.2.1:*:*:*:*:*:*:* | 8.2.1 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:communications_session_route_manager:8.1.1:*:*:*:*:*:*:* | 8.1.1 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:communications_session_route_manager:8.2.0:*:*:*:*:*:*:* | 8.2.0 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:communications_session_route_manager:8.2.1:*:*:*:*:*:*:* | 8.2.1 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:* | 12.4.0.0 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:instantis_enterprisetrack:*:*:*:*:*:*:*:* | 17.1 – 17.3 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:sd-wan_aware:8.2:*:*:*:*:*:*:* | 8.2 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* | 8.8 | Vulnerable | Oracle |
- cpe:2.3:o:broadcom:brocade_fabric_operating_system:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Broadcom
- cpe:2.3:a:oracle:communications_element_manager:8.1.1:*:*:*:*:*:*:* Versions 8.1.1 Vulnerable ·Oracle
- cpe:2.3:a:oracle:communications_element_manager:8.2.0:*:*:*:*:*:*:* Versions 8.2.0 Vulnerable ·Oracle
- cpe:2.3:a:oracle:communications_element_manager:8.2.1:*:*:*:*:*:*:* Versions 8.2.1 Vulnerable ·Oracle
- cpe:2.3:a:oracle:communications_session_report_manager:8.1.1:*:*:*:*:*:*:* Versions 8.1.1 Vulnerable ·Oracle
- cpe:2.3:a:oracle:communications_session_report_manager:8.2.0:*:*:*:*:*:*:* Versions 8.2.0 Vulnerable ·Oracle
- cpe:2.3:a:oracle:communications_session_report_manager:8.2.1:*:*:*:*:*:*:* Versions 8.2.1 Vulnerable ·Oracle
- cpe:2.3:a:oracle:communications_session_route_manager:8.1.1:*:*:*:*:*:*:* Versions 8.1.1 Vulnerable ·Oracle
- cpe:2.3:a:oracle:communications_session_route_manager:8.2.0:*:*:*:*:*:*:* Versions 8.2.0 Vulnerable ·Oracle
- cpe:2.3:a:oracle:communications_session_route_manager:8.2.1:*:*:*:*:*:*:* Versions 8.2.1 Vulnerable ·Oracle
- cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:* Versions 12.4.0.0 Vulnerable ·Oracle
- cpe:2.3:a:oracle:instantis_enterprisetrack:*:*:*:*:*:*:*:* Versions 17.1 – 17.3 Vulnerable ·Oracle
- cpe:2.3:a:oracle:sd-wan_aware:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Oracle
- cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* Versions 8.8 Vulnerable ·Oracle
Remediation
Red Hat 5 advisories
- RHSA-2020:4751 Released 2020-11-04 · Red Hat rating Moderatehttpd:2.4 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 8) httpd-2.4.37-30.module+el8.3.0+7001+0766b9e7.aarch64::httpd:2.4, httpd-2.4.37-30.module+el8.3.0+7001+0766b9e7.ppc64le::httpd:2.4, httpd-2.4.37-30.module+el8.3.0+7001+0766b9e7.s390x::httpd:2.4 +38
- RHSA-2020:3958 Released 2020-09-29 · Red Hat rating Moderatehttpd security, bug fix, and enhancement update
- Red Hat Enterprise Linux Client Optional (v. 7) httpd-2.4.6-95.el7, httpd-devel-2.4.6-95.el7, httpd-manual-2.4.6-95.el7 +5
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd-2.4.6-95.el7, httpd-devel-2.4.6-95.el7, httpd-manual-2.4.6-95.el7 +5
- Red Hat Enterprise Linux Server (v. 7) httpd-2.4.6-95.el7, httpd-devel-2.4.6-95.el7, httpd-manual-2.4.6-95.el7 +3
- Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap-2.4.6-95.el7, mod_proxy_html-1:2.4.6-95.el7
- Red Hat Enterprise Linux Workstation (v. 7) httpd-2.4.6-95.el7, httpd-devel-2.4.6-95.el7, httpd-manual-2.4.6-95.el7 +3
- Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap-2.4.6-95.el7, mod_proxy_html-1:2.4.6-95.el7
- RHSA-2020:2263 Released 2020-05-26 · Red Hat rating Moderatehttpd24-httpd and httpd24-mod_md security and enhancement update
- Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-httpd-2.4.34-18.el6, httpd24-httpd-devel-2.4.34-18.el6, httpd24-httpd-manual-2.4.34-18.el6 +5
- Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-httpd-2.4.34-18.el7, httpd24-httpd-devel-2.4.34-18.el7, httpd24-httpd-manual-2.4.34-18.el7 +6
- Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) httpd24-httpd-2.4.34-18.el7, httpd24-httpd-devel-2.4.34-18.el7, httpd24-httpd-manual-2.4.34-18.el7 +6
- Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) httpd24-httpd-2.4.34-18.el7, httpd24-httpd-devel-2.4.34-18.el7, httpd24-httpd-manual-2.4.34-18.el7 +6
- Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-httpd-2.4.34-18.el6, httpd24-httpd-devel-2.4.34-18.el6, httpd24-httpd-manual-2.4.34-18.el6 +5
- Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-httpd-2.4.34-18.el7, httpd24-httpd-devel-2.4.34-18.el7, httpd24-httpd-manual-2.4.34-18.el7 +6
Show 2 more Red Hat advisories
- RHSA-2020:1337 Released 2020-04-06 · Red Hat rating ModerateRed Hat JBoss Core Services Apache HTTP Server 2.4.37 SP2 security update
- Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-apr-1.6.3-86.jbcs.el6, jbcs-httpd24-apr-devel-1.6.3-86.jbcs.el6, jbcs-httpd24-brotli-1.0.6-21.jbcs.el6 +17
- Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr-1.6.3-86.jbcs.el7, jbcs-httpd24-apr-devel-1.6.3-86.jbcs.el7, jbcs-httpd24-brotli-1.0.6-21.jbcs.el7 +17
- RHSA-2020:1336 Released 2020-04-06 · Red Hat rating ModerateRed Hat JBoss Core Services Apache HTTP Server 2.4.37 SP2 security update
- JBoss Core Services Apache HTTP Server 2.4.37 SP2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| JBoss Core Services Apache HTTP Server 2.4.37 SP2 | Fixed | RHSA-2020:1336 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2020:4751 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2020:3958 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2020:3958 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2020:3958 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2020:3958 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2020:3958 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2020:3958 |
| Red Hat JBoss Core Services on RHEL 6 Server | Fixed | RHSA-2020:1337 |
| Red Hat JBoss Core Services on RHEL 7 Server | Fixed | RHSA-2020:1337 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2020:2263 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2020:2263 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) | Fixed | RHSA-2020:2263 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) | Fixed | RHSA-2020:2263 |
| Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2020:2263 |
| Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2020:2263 |
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat JBoss Enterprise Web Server 2
Timeline
- 2026-10-02 Threatist record created from CVE-2020-1927
- 2026-10-03 Alias added: GHSA-h8gj-rgqf-fpq3
References
Patch 2
Advisory 10
- [oss-security] 20200403 Re: CVE-2020-1927: mod_rewrite configurations vulnerable to open redirect
- [oss-security] 20200403 Re: CVE-2020-1927: mod_rewrite configurations vulnerable to open redirect
- openSUSE-SU-2020:0597
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://security.netapp.com/advisory/ntap-20200413-0002/
- USN-4458-1
- FEDORA-2020-189a1e6c3e
- DSA-4757
- FEDORA-2020-0d3d3f5072
- [debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security update
Other 15
- [httpd-dev] 20200404 Odd vulnerabilities_24.html output
- [httpd-dev] 20200404 Re: Odd vulnerabilities_24.html output
- [httpd-cvs] 20200411 svn commit: r1876405 - in /httpd/test/framework/trunk/t: conf/core.conf.in security/CVE-2020-1927.t
- [httpd-cvs] 20200412 svn commit: r1876426 - /httpd/test/framework/trunk/t/security/CVE-2020-1927.t
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/
- [httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/
- [httpd-cvs] 20210330 svn commit: r1888194 [13/13] - /httpd/site/trunk/content/security/json/
- [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.html
- [httpd-cvs] 20210330 svn commit: r1073139 [13/13] - in /websites/staging/httpd/trunk/content: ./ security/json/
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/
- [httpd-cvs] 20210330 svn commit: r1073149 [13/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/
- [httpd-cvs] 20210330 svn commit: r1073158 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-1927.json security/vulnerabilities_24.html
- [httpd-cvs] 20210330 svn commit: r1888215 - /httpd/site/trunk/content/security/json/CVE-2020-1927.json
- [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/vulnerabilities_24.html
- https://www.oracle.com/security-alerts/cpujul2022.html
More Apache Http Server vulnerabilities
- TI-2021-18535 Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773) KEVCVSS 3.1CRITICAL 9.8
- TI-2021-18417 Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 KEVCVSS 3.1CRITICAL 9.8
- TI-2024-25716 Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path. KEVCVSS 3.1CRITICAL 9.1
- TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
- TI-2019-00184 Use after free in Apache HTTP Server KEVCVSS 3.1HIGH 7.8
- TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2020-1927 · CVE Program
- CVE-2020-1927 · NVD
- FIRST EPSS
- GHSA-h8gj-rgqf-fpq3 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-1927 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences