Evidence used
- No CISA KEV confirmation is currently recorded.
- EPSS is 0.65% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2025
CVE-2025-66200High confidence
Apache HTTP Server: mod_userdir+suexec bypass via AllowOverride FileInfo
Apache Software Foundation · Apache HTTP Server
5.4MediumCVSS 3.1
Scheduled
Patch availableMedium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityMedium→Operational priority:Medium, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Apache Software Foundation Apache HTTP Server and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Distribution package intelligence
8 package statesRelease-specific package status
Alpine, Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Alpine v3.23v3.23 · main | apache2 | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 2.4.66-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Alpine v3.22v3.22 · main | apache2 | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 2.4.66-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Alpine v3.21v3.21 · main | apache2 | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 2.4.66-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Debian trixietrixie · source | apache2 | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.4.66-1~deb13u1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian bookwormbookworm · source | apache2 | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.4.66-1~deb12u1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian forkyforky · source | apache2 | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.4.66-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian sidsid · source | apache2 | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.4.66-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | apache2 | Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree. | 2.4.58-1ubuntu8.10 | Canonical Ubuntu Security ↗Source updated 5 Oct 2026 |
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2025-66200 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityhttpd: Apache HTTP Server: mod_userdir+suexec bypass via AllowOverride FileInfo
The vendor explicitly identifies these products as affected by this CVE.
- httpd as a component of Red Hat Enterprise Linux 6
- httpd-devel as a component of Red Hat Enterprise Linux 6
- httpd-manual as a component of Red Hat Enterprise Linux 6
- httpd-tools as a component of Red Hat Enterprise Linux 6
- httpd.src as a component of Red Hat Enterprise Linux 6
- mod_ssl as a component of Red Hat Enterprise Linux 6
- httpd as a component of Red Hat Enterprise Linux 7
- httpd-devel as a component of Red Hat Enterprise Linux 7
- httpd-manual as a component of Red Hat Enterprise Linux 7
- httpd-tools as a component of Red Hat Enterprise Linux 7
- httpd.src as a component of Red Hat Enterprise Linux 7
- mod_ldap as a component of Red Hat Enterprise Linux 7
- Summary
- A permissions bypass flaw has been discovered in the apache HTTP server. Users with access to use the RequestHeader directive in htaccess can cause some CGI scripts to run under an unexpected userid.
- Remediation
- Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Patch available01
What, why and how
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.
What
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.
Why
The product requires authentication, but the product has an alternate path or channel that does not require authentication.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
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.
Why
The product requires authentication, but the product has an alternate path or channel that does not require authentication.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → Authentication Bypass Using an Alternate Path or Channel → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- Low: a basic authenticated account is required
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-288 ↗
CWE-288: Authentication Bypass Using an Alternate Path or Channel. The product requires authentication, but the product has an alternate path or channel that does not require authentication.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:LCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.ILowIntegrity impact: A successful attack can cause a limited loss.ALowAvailability impact: A successful attack can cause a limited loss.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Patch available
- Affected
- httpd as a component of Red Hat Enterprise Linux 6
- httpd-devel as a component of Red Hat Enterprise Linux 6
- httpd-manual as a component of Red Hat Enterprise Linux 6
- httpd-tools as a component of Red Hat Enterprise Linux 6
- httpd.src as a component of Red Hat Enterprise Linux 6
- mod_ssl as a component of Red Hat Enterprise Linux 6
- httpd as a component of Red Hat Enterprise Linux 7
- httpd-devel as a component of Red Hat Enterprise Linux 7
- httpd-manual as a component of Red Hat Enterprise Linux 7
- httpd-tools as a component of Red Hat Enterprise Linux 7
- httpd.src as a component of Red Hat Enterprise Linux 7
- mod_ldap as a component of Red Hat Enterprise Linux 7
- mod_proxy_html as a component of Red Hat Enterprise Linux 7
- mod_session as a component of Red Hat Enterprise Linux 7
- mod_ssl as a component of Red Hat Enterprise Linux 7
- Fixed
- jbcs-httpd24-httpd-0:2.4.62-11.el7jbcs.src as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-httpd-0:2.4.62-11.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-httpd-debuginfo-0:2.4.62-11.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-httpd-devel-0:2.4.62-11.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-httpd-manual-0:2.4.62-11.el7jbcs.noarch as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-httpd-selinux-0:2.4.62-11.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-httpd-tools-0:2.4.62-11.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-mod_ldap-0:2.4.62-11.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-mod_proxy_html-1:2.4.62-11.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-mod_session-0:2.4.62-11.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-mod_ssl-1:2.4.62-11.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-httpd-0:2.4.62-11.el8jbcs.src as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-httpd-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-httpd-debuginfo-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-httpd-devel-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-httpd-manual-0:2.4.62-11.el8jbcs.noarch as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-httpd-selinux-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-httpd-tools-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-httpd-tools-debuginfo-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-mod_ldap-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-mod_ldap-debuginfo-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-mod_proxy_html-1:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-mod_proxy_html-debuginfo-1:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-mod_session-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-mod_session-debuginfo-0:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-mod_ssl-1:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-mod_ssl-debuginfo-1:2.4.62-11.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- httpd-0:2.4.63-4.el10_1.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
- httpd-0:2.4.63-4.el10_1.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
- httpd-0:2.4.63-4.el10_1.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
- and 236 more
- Action
- Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
Official vendor articles1 stored document
Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.
- About the security content of macOS Tahoe 26.4 - Apple Support →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Apple Store Mac iPad iPhone Watch Vision AirPods TV & Home Entertainment Accessories Support 0 + "},{"name":"compact","assetInline":" "}],"analyticsAttributes":[{"name":"data-analytics-title","value":"apple home"}]},{"id":"ad4a2a26eb4836393385e9f6c61b526b4a3cb31409c5ed8730ce7a704dd7132f","name":"store","te
04
Evidence and provenance
Published 5 Dec 2025 · Last source change 5 Dec 2025, 17:38 UTC · CWE-288 · Authentication Bypass Using an Alternate Path or Channel
CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source FIRST · tracked since 2026-08-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2025-201403
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCISA ADP
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- 2.4.7 ≤ 2.4.65 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- After
- 2.4.7 ≤ 2.4.65 · Fixed: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Remediation statusRemediation status changed from Awaiting fix to Patch available.Red Hat Product Security ↗
- Before
- Awaiting fix
- After
- Patch available
CVE published
Fixed release recorded from official guidance
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.