Mod_proxy_cluster: mod_proxy_cluster unauthorized mcmp requests
A vulnerability was found in mod_proxy_cluster. The issue is that the <Directory> directive should be replaced by the <Location> directive as the former does not restrict IP/host access as `Require ip IP_ADDRESS` would suggest. This means that anyone with access to the host might send MCMP requests that may result in adding/removing/updating nodes for the balancing. However, this host should not be accessible to the public network as it does not serve the general traffic.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Apr 23, 2025
- Updated
- Jun 29, 2026
- EPSS
- 0.3% · 23th percentile
- CWE
- CWE-863
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Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.4 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · redhat
- 5.4
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
github.com/modcluster/mod_proxy_cluster mod_proxy_cluster
- 1.3.17 and later · before 1.3.21.Finalaffected · semver
Red Hat Red Hat Enterprise Linux 10
- 0:1.3.21-1.el10 and laternot affected · rpm
- 0:1.3.22-1.el10_0.2 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 9
- 0:1.3.22-1.el9_5.2 and laternot affected · rpm
- 0:1.3.22-1.el9_6.1 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
- 0:1.3.22-1.el9_4.1 and laternot affected · rpm
Red Hat Red Hat JBoss Core Services
- all versionsaffected
- all versionsaffected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | mod_proxy_cluster | before 1.3.22-1.el10_0.2 | 1.3.22-1.el10_0.2 |
| AlmaLinux:9 | mod_proxy_cluster | before 1.3.22-1.el9_6.1 | 1.3.22-1.el9_6.1 |
| Red Hat:enterprise_linux:10.0 | mod_proxy_cluster | before 0:1.3.22-1.el10_0.2 | 0:1.3.22-1.el10_0.2 |
| Red Hat:enterprise_linux:10.0 | mod_proxy_cluster | before 0:1.3.21-1.el10 | 0:1.3.21-1.el10 |
| Red Hat:enterprise_linux:10.0 | mod_proxy_cluster-debuginfo | before 0:1.3.21-1.el10 | 0:1.3.21-1.el10 |
| Red Hat:enterprise_linux:10.0 | mod_proxy_cluster-debuginfo | before 0:1.3.22-1.el10_0.2 | 0:1.3.22-1.el10_0.2 |
| Red Hat:enterprise_linux:10.0 | mod_proxy_cluster-debugsource | before 0:1.3.22-1.el10_0.2 | 0:1.3.22-1.el10_0.2 |
| Red Hat:enterprise_linux:10.0 | mod_proxy_cluster-debugsource | before 0:1.3.21-1.el10 | 0:1.3.21-1.el10 |
| Red Hat:enterprise_linux:9::appstream | mod_proxy_cluster | before 0:1.3.22-1.el9_5.2 | 0:1.3.22-1.el9_5.2 |
| Red Hat:enterprise_linux:9::appstream | mod_proxy_cluster | before 0:1.3.22-1.el9_6.1 | 0:1.3.22-1.el9_6.1 |
| Red Hat:enterprise_linux:9::appstream | mod_proxy_cluster-debuginfo | before 0:1.3.22-1.el9_5.2 | 0:1.3.22-1.el9_5.2 |
| Red Hat:enterprise_linux:9::appstream | mod_proxy_cluster-debuginfo | before 0:1.3.22-1.el9_6.1 | 0:1.3.22-1.el9_6.1 |
| Red Hat:enterprise_linux:9::appstream | mod_proxy_cluster-debugsource | before 0:1.3.22-1.el9_6.1 | 0:1.3.22-1.el9_6.1 |
| Red Hat:enterprise_linux:9::appstream | mod_proxy_cluster-debugsource | before 0:1.3.22-1.el9_5.2 | 0:1.3.22-1.el9_5.2 |
| Red Hat:rhel_eus:9.4::appstream | mod_proxy_cluster | before 0:1.3.22-1.el9_4.1 | 0:1.3.22-1.el9_4.1 |
| Red Hat:rhel_eus:9.4::appstream | mod_proxy_cluster-debuginfo | before 0:1.3.22-1.el9_4.1 | 0:1.3.22-1.el9_4.1 |
| Red Hat:rhel_eus:9.4::appstream | mod_proxy_cluster-debugsource | before 0:1.3.22-1.el9_4.1 | 0:1.3.22-1.el9_4.1 |
| Rocky Linux:10 | mod_proxy_cluster | before 0:1.3.22-1.el10_0.2 | 0:1.3.22-1.el10_0.2 |
| Rocky Linux:9 | mod_proxy_cluster | before 0:1.3.22-1.el9_6.1 | 0:1.3.22-1.el9_6.1 |
Same product
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Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| github.com/modcluster/mod_proxy_cluster mod_proxy_cluster | 1.3.21.Final | Vendor (CNA) |
| almalinux:mod_proxy_cluster | 1.3.22-1.el9_6.1 · AlmaLinux:9 | Package registry (OSV) |
| red hat:mod_proxy_cluster | 0:1.3.22-1.el9_5.2 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:mod_proxy_cluster-debuginfo | 0:1.3.22-1.el9_5.2 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:mod_proxy_cluster-debugsource | 0:1.3.22-1.el9_5.2 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| rocky linux:mod_proxy_cluster | 0:1.3.22-1.el9_6.1 · Rocky Linux:9 | Package 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.
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.
Credits
All researchersFinders, 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.
- CVE-2026-7867470 days apartUdisks2: udisks2: local privilege escalation via as-user option spoofing31Monitor
- CVE-2026-19685488 days apartNetworkmanager: networkmanager: 802-1x ca-path and phase2-ca-path bypass private_user restriction, allowing wpa-enterprise server validation bypass (incomplete 28Monitor
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).
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
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-863 · Incorrect AuthorizationCVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHBA-2025:2973
- access.redhat.com/errata/RHBA-2025:5309
- access.redhat.com/errata/RHSA-2025:9434
- access.redhat.com/errata/RHSA-2025:9466
- access.redhat.com/errata/RHSA-2025:9997
- access.redhat.com/security/cve/CVE-2024-10306
- bugzilla.redhat.com/show_bug.cgi?id=2321302
- github.com/modcluster/mod_proxy_cluster/pull/309
Vendor advisories and official records. Exploit/PoC links are deliberately left out.