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NVD / CVE Program· CNA apache

CVE-2020-11985: IP address spoofing when proxying using mod_remoteip and mod_rewrite For configurations using proxying with mod_remoteip and certain mod_rew

Noroxi assessment

Priority: Monitor (action score 23/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 7% (FIRST EPSS); higher than 94.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: apache2 (Debian:12) 2.4.25-1; httpd (Red Hat:enterprise_linux:7::client) 0:2.4.6-40.el7; httpd-debuginfo (Red Hat:enterprise_linux:7::client) 0:2.4.6-40.el7.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to apache2 (Debian:12) 2.4.25-1; httpd (Red Hat:enterprise_linux:7::client) 0:2.4.6-40.el7; httpd-debuginfo (Red Hat:enterprise_linux:7::client) 0:2.4.6-40.el7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Aug 7, 2020
Updated
Jun 16, 2026
EPSS
7.0% · 94th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 7.0%

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  • Not in KEV: no record of exploitation in the wild
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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apachehttp server

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When you'll hear from us

  • when a new CVE affecting this product is published
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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache http server2.4.1 and later · up to 2.4.23 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a Apache HTTP Server

    • 2.4.1 to 2.4.23affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12apache2before 2.4.25-12.4.25-1
Red Hat:enterprise_linux:7::clienthttpdbefore 0:2.4.6-40.el70:2.4.6-40.el7
Red Hat:enterprise_linux:7::clienthttpd-debuginfobefore 0:2.4.6-40.el70:2.4.6-40.el7
Red Hat:enterprise_linux:7::clienthttpd-develbefore 0:2.4.6-40.el70:2.4.6-40.el7
Red Hat:enterprise_linux:7::clienthttpd-manualbefore 0:2.4.6-40.el70:2.4.6-40.el7
Red Hat:enterprise_linux:7::clienthttpd-toolsbefore 0:2.4.6-40.el70:2.4.6-40.el7
Red Hat:enterprise_linux:7::clientmod_ldapbefore 0:2.4.6-40.el70:2.4.6-40.el7
Red Hat:enterprise_linux:7::clientmod_proxy_htmlbefore 1:2.4.6-40.el71:2.4.6-40.el7
Red Hat:enterprise_linux:7::clientmod_sessionbefore 0:2.4.6-40.el70:2.4.6-40.el7
Red Hat:enterprise_linux:7::clientmod_sslbefore 1:2.4.6-40.el71:2.4.6-40.el7
Red Hat:rhel_software_collections:2::el6httpd24-httpdbefore 0:2.4.25-9.el60:2.4.25-9.el6
Red Hat:rhel_software_collections:2::el6httpd24-httpd-debuginfobefore 0:2.4.25-9.el60:2.4.25-9.el6
Red Hat:rhel_software_collections:2::el6httpd24-httpd-develbefore 0:2.4.25-9.el60:2.4.25-9.el6
Red Hat:rhel_software_collections:2::el6httpd24-httpd-manualbefore 0:2.4.25-9.el60:2.4.25-9.el6
Red Hat:rhel_software_collections:2::el6httpd24-httpd-toolsbefore 0:2.4.25-9.el60:2.4.25-9.el6
Red Hat:rhel_software_collections:2::el6httpd24-mod_ldapbefore 0:2.4.25-9.el60:2.4.25-9.el6
Red Hat:rhel_software_collections:2::el6httpd24-mod_proxy_htmlbefore 1:2.4.25-9.el61:2.4.25-9.el6
Red Hat:rhel_software_collections:2::el6httpd24-mod_sessionbefore 0:2.4.25-9.el60:2.4.25-9.el6
Red Hat:rhel_software_collections:2::el6httpd24-mod_sslbefore 1:2.4.25-9.el61:2.4.25-9.el6
Red Hat:rhel_software_collections:2::el7httpd24-httpdbefore 0:2.4.25-9.el70:2.4.25-9.el7
Red Hat:rhel_software_collections:2::el7httpd24-httpd-debuginfobefore 0:2.4.25-9.el70:2.4.25-9.el7
Red Hat:rhel_software_collections:2::el7httpd24-httpd-develbefore 0:2.4.25-9.el70:2.4.25-9.el7
Red Hat:rhel_software_collections:2::el7httpd24-httpd-manualbefore 0:2.4.25-9.el70:2.4.25-9.el7
Red Hat:rhel_software_collections:2::el7httpd24-httpd-toolsbefore 0:2.4.25-9.el70:2.4.25-9.el7

+5

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-42013Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)KEV
    99Now
  • CVE-2021-41773Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49KEV
    99Now
  • CVE-2024-38475Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.KEV
    96Now

Published before and after this one in the same product

  • ← EarlierCVE-2020-1927Apr 1, 2020 · 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 en
    41Plan
  • ← EarlierCVE-2020-11984Aug 7, 2020 · Apache HTTP server 2.4.32 to 2.4.44 mod_proxy_uwsgi info disclosure and possible RCE
    66This week
  • Later →CVE-2020-11993Aug 7, 2020 · Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, loggin
    47Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:apache22.4.25-1 · Debian:12Package registry (OSV)
red hat:httpd0:2.4.6-40.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd-debuginfo0:2.4.6-40.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd-devel0:2.4.6-40.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd-manual0:2.4.6-40.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd-tools0:2.4.6-40.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:httpd24-httpd0:2.4.25-9.el6 · Red Hat:rhel_software_collections:2::el6Package registry (OSV)
red hat:httpd24-httpd-debuginfo0:2.4.25-9.el6 · Red Hat:rhel_software_collections:2::el6Package registry (OSV)
red hat:httpd24-httpd-devel0:2.4.25-9.el6 · Red Hat:rhel_software_collections:2::el6Package registry (OSV)
red hat:mod_ldap0:2.4.6-40.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:mod_proxy_html1:2.4.6-40.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:mod_session0:2.4.6-40.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:mod_ssl1:2.4.6-40.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:apache22.4.23-29.63.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-345 · Insufficient Verification of Data Authenticity

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (15 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records