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NVD / CVE Program· CNA apache

CVE-2025-66200: Apache HTTP Server: mod_userdir+suexec bypass via AllowOverride FileInfo

MediumCVSS 5.4 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 21/100)

  • 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: 0.69% (FIRST EPSS); higher than 53.4% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Apache Software Foundation Apache HTTP Server 2.4.66; azl3 httpd 2.4.65-1 on Azure Linux 3.0 2.4.66-1; cbl2 httpd 2.4.65-1 on CBL Mariner 2.0 2.4.66-1.

Low priority for now. Upgrade to Apache Software Foundation Apache HTTP Server 2.4.66; azl3 httpd 2.4.65-1 on Azure Linux 3.0 2.4.66-1; cbl2 httpd 2.4.65-1 on CBL Mariner 2.0 2.4.66-1 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

mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in Apache HTTP Server. Users with access to use the RequestHeader directive in htaccess can cause some CGI scripts to run under an unexpected userid. This issue affects Apache HTTP Server: from 2.4.7 through 2.4.65. Users are recommended to upgrade to version 2.4.66, which fixes the issue.

Published
Dec 5, 2025
Updated
Oct 18, 2026
EPSS
0.6% · 53th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-66200

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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
  • when a record in your stack enters KEV or is weaponized

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Is Apache HTTP Server on your server exposed to the internet?Run a port scan

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every Monday

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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.

  • Apache Software Foundation Apache HTTP Server

    • 2.4.7 and later · up to and including 2.4.65affected · semver

Affected versions

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

  • apache http server2.4.7 and later · before 2.4.66

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10httpd-filesystembefore 2.4.63-4.el10_1.32.4.63-4.el10_1.3
AlmaLinux:8httpdbefore 2.4.37-65.module_el8.10.0+4088+57f011c1.72.4.37-65.module_el8.10.0+4088+57f011c1.7
AlmaLinux:8httpd-develbefore 2.4.37-65.module_el8.10.0+4088+57f011c1.72.4.37-65.module_el8.10.0+4088+57f011c1.7
AlmaLinux:8httpd-filesystembefore 2.4.37-65.module_el8.10.0+4088+57f011c1.72.4.37-65.module_el8.10.0+4088+57f011c1.7
AlmaLinux:8httpd-manualbefore 2.4.37-65.module_el8.10.0+4088+57f011c1.72.4.37-65.module_el8.10.0+4088+57f011c1.7
AlmaLinux:8httpd-toolsbefore 2.4.37-65.module_el8.10.0+4088+57f011c1.72.4.37-65.module_el8.10.0+4088+57f011c1.7
AlmaLinux:8mod_http2before 1.15.7-10.module_el8.10.0+4044+ea5f78b1.41.15.7-10.module_el8.10.0+4044+ea5f78b1.4
AlmaLinux:8mod_ldapbefore 2.4.37-65.module_el8.10.0+4088+57f011c1.72.4.37-65.module_el8.10.0+4088+57f011c1.7
AlmaLinux:8mod_mdbefore 1:2.0.8-8.module_el8.10.0+4088+57f011c1.21:2.0.8-8.module_el8.10.0+4088+57f011c1.2
AlmaLinux:8mod_proxy_htmlbefore 1:2.4.37-65.module_el8.10.0+4088+57f011c1.71:2.4.37-65.module_el8.10.0+4088+57f011c1.7
AlmaLinux:8mod_sessionbefore 2.4.37-65.module_el8.10.0+4088+57f011c1.72.4.37-65.module_el8.10.0+4088+57f011c1.7
AlmaLinux:8mod_sslbefore 1:2.4.37-65.module_el8.10.0+4088+57f011c1.71:2.4.37-65.module_el8.10.0+4088+57f011c1.7
AlmaLinux:9httpdbefore 2.4.62-7.el9_7.32.4.62-7.el9_7.3
AlmaLinux:9httpd-corebefore 2.4.62-7.el9_7.32.4.62-7.el9_7.3
AlmaLinux:9httpd-develbefore 2.4.62-7.el9_7.32.4.62-7.el9_7.3
AlmaLinux:9httpd-filesystembefore 2.4.62-7.el9_7.32.4.62-7.el9_7.3
AlmaLinux:9httpd-manualbefore 2.4.62-7.el9_7.32.4.62-7.el9_7.3
AlmaLinux:9httpd-toolsbefore 2.4.62-7.el9_7.32.4.62-7.el9_7.3
AlmaLinux:9mod_ldapbefore 2.4.62-7.el9_7.32.4.62-7.el9_7.3
AlmaLinux:9mod_luabefore 2.4.62-7.el9_7.32.4.62-7.el9_7.3
AlmaLinux:9mod_proxy_htmlbefore 1:2.4.62-7.el9_7.31:2.4.62-7.el9_7.3
AlmaLinux:9mod_sessionbefore 2.4.62-7.el9_7.32.4.62-7.el9_7.3
AlmaLinux:9mod_sslbefore 1:2.4.62-7.el9_7.31:2.4.62-7.el9_7.3
Alpine:v3.20apache2before 2.4.66-r02.4.66-r0

+96

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-2025-58098Dec 5, 2025 · Apache HTTP Server: Server Side Includes adds query string to #exec cmd=...
    33Monitor
  • ← EarlierCVE-2025-55753Dec 5, 2025 · Apache HTTP Server: mod_md (ACME), unintended retry intervals
    30Monitor
  • Later →CVE-2026-24072May 4, 2026 · Apache HTTP Server: mod_rewrite elevation of privileges via ap_expr
    35Monitor

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
Apache Software Foundation Apache HTTP Server2.4.66 · descriptionVendor (CNA)
azl3 httpd 2.4.65-1 on Azure Linux 3.02.4.66-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 httpd 2.4.65-1 on CBL Mariner 2.02.4.66-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:httpd2.4.37-65.module_el8.10.0+4088+57f011c1.7 · AlmaLinux:8Package registry (OSV)
almalinux:httpd-core2.4.62-7.el9_7.3 · AlmaLinux:9Package registry (OSV)
almalinux:httpd-devel2.4.37-65.module_el8.10.0+4088+57f011c1.7 · AlmaLinux:8Package registry (OSV)
almalinux:httpd-filesystem2.4.37-65.module_el8.10.0+4088+57f011c1.7 · AlmaLinux:8Package registry (OSV)
almalinux:httpd-manual2.4.37-65.module_el8.10.0+4088+57f011c1.7 · AlmaLinux:8Package registry (OSV)
almalinux:httpd-tools2.4.37-65.module_el8.10.0+4088+57f011c1.7 · AlmaLinux:8Package registry (OSV)
almalinux:mod_http21.15.7-10.module_el8.10.0+4044+ea5f78b1.4 · AlmaLinux:8Package registry (OSV)
almalinux:mod_ldap2.4.37-65.module_el8.10.0+4088+57f011c1.7 · AlmaLinux:8Package registry (OSV)
almalinux:mod_md1:2.0.8-8.module_el8.10.0+4088+57f011c1.2 · AlmaLinux:8Package registry (OSV)
almalinux:mod_proxy_html1:2.4.37-65.module_el8.10.0+4088+57f011c1.7 · AlmaLinux:8Package registry (OSV)
almalinux:mod_session2.4.37-65.module_el8.10.0+4088+57f011c1.7 · AlmaLinux:8Package registry (OSV)
almalinux:mod_ssl1:2.4.37-65.module_el8.10.0+4088+57f011c1.7 · AlmaLinux:8Package registry (OSV)
alpine:apache22.4.66-r0 · Alpine:v3.20Package registry (OSV)
debian:apache22.4.66-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:apache22.4.58-150600.5.41.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-devel2.4.58-150600.5.41.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-event2.4.58-150600.5.41.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-manual2.4.58-150600.5.41.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-prefork2.4.58-150600.5.41.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-utils2.4.58-150600.5.41.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-worker2.4.58-150600.5.41.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:httpd0:2.4.37-65.module+el8.10.0+23815+1b5e1c66.7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-debuginfo0:2.4.37-65.module+el8.10.0+23815+1b5e1c66.7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-debugsource0:2.4.37-65.module+el8.10.0+23815+1b5e1c66.7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-devel0:2.4.37-65.module+el8.10.0+23815+1b5e1c66.7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-filesystem0:2.4.37-65.module+el8.10.0+23815+1b5e1c66.7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-manual0:2.4.37-65.module+el8.10.0+23815+1b5e1c66.7 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)

+22

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.

Credits

All researchers

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

Chain candidates

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

  • CVE-2026-23918150 days apartApache HTTP Server: http2: double free and possible RCE on early reset
    50Plan

Not on record for this CVE: EPSS history · patch commit or PR link · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • 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
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-288 · Authentication Bypass Using an Alternate Path or Channel

CVSS vector

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

nvd-secondary

Attack context

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

References

Show all references (1 more)

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

All records