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CVE-2019-3878· NVD / CVE Program· CNA redhat

A vulnerability was found in mod_auth_mellon before v0.14.2.

Noroxi assessment

Priority: Monitor (action score 33/100)

  • 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: 2.9% (FIRST EPSS); higher than 87% 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. Special conditions such as timing or configuration are required.
  • Fixed version: libapache2-mod-auth-mellon (Debian:12) 0.14.2-1; libapache2-mod-auth-mellon (Debian:9) 0.12.0-2+deb9u1; mod_auth_mellon (Red Hat:enterprise_linux:7::server) 0:0.14.0-2.el7_6.4.

Low priority for now. Upgrade to libapache2-mod-auth-mellon (Debian:12) 0.14.2-1; libapache2-mod-auth-mellon (Debian:9) 0.12.0-2+deb9u1; mod_auth_mellon (Red Hat:enterprise_linux:7::server) 0:0.14.0-2.el7_6.4 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

A vulnerability was found in mod_auth_mellon before v0.14.2. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.

HighCVSS 8.1 · v3.0—No exploit Fix available
Published
Mar 26, 2019
Updated
Jun 16, 2026
EPSS
2.9% · 87th percentile

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.9%

CNA vs NVD score

NVD
8.1
CNA · redhat
8.1
agree

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2019-3878

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?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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
mod auth mellon projectmod auth mellon
fedoraprojectfedora
redhatenterprise linux
redhatenterprise linux desktop
redhatenterprise linux server
redhatenterprise linux server aus
redhatenterprise linux server eus
redhatenterprise linux server tus
redhatenterprise linux workstation
canonicalubuntu linux

Affected versions

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

  • canonical ubuntu linux18.04
  • canonical ubuntu linux18.10
  • fedoraproject fedora29
  • fedoraproject fedora30
  • mod auth mellon project mod auth mellonbefore 0.14.2
  • redhat enterprise linux7.0
  • redhat enterprise linux desktop7.0
  • redhat enterprise linux server7.0
  • redhat enterprise linux server aus7.6
  • redhat enterprise linux server eus7.6
  • redhat enterprise linux server tus7.6
  • redhat enterprise linux workstation7.0

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.

  • uninett mod_auth_mellon

    • before v0.14.2affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12libapache2-mod-auth-mellonbefore 0.14.2-10.14.2-1
Debian:9libapache2-mod-auth-mellonbefore 0.12.0-2+deb9u10.12.0-2+deb9u1
Red Hat:enterprise_linux:7::servermod_auth_mellonbefore 0:0.14.0-2.el7_6.40:0.14.0-2.el7_6.4
Red Hat:enterprise_linux:7::servermod_auth_mellon-debuginfobefore 0:0.14.0-2.el7_6.40:0.14.0-2.el7_6.4
Red Hat:enterprise_linux:7::servermod_auth_mellon-diagnosticsbefore 0:0.14.0-2.el7_6.40:0.14.0-2.el7_6.4
Red Hat:enterprise_linux:8::appstreammod_auth_mellonbefore 0:0.14.0-3.el8_0.20:0.14.0-3.el8_0.2
Red Hat:enterprise_linux:8::appstreammod_auth_mellon-debuginfobefore 0:0.14.0-3.el8_0.20:0.14.0-3.el8_0.2
Red Hat:enterprise_linux:8::appstreammod_auth_mellon-debugsourcebefore 0:0.14.0-3.el8_0.20:0.14.0-3.el8_0.2
Red Hat:enterprise_linux:8::appstreammod_auth_mellon-diagnostics-debuginfobefore 0:0.14.0-3.el8_0.20:0.14.0-3.el8_0.2
Red Hat:rhel_software_collections:3::el6httpd24-httpdbefore 0:2.4.34-7.el6.10:2.4.34-7.el6.1
Red Hat:rhel_software_collections:3::el6httpd24-httpd-debuginfobefore 0:2.4.34-7.el6.10:2.4.34-7.el6.1
Red Hat:rhel_software_collections:3::el6httpd24-httpd-develbefore 0:2.4.34-7.el6.10:2.4.34-7.el6.1
Red Hat:rhel_software_collections:3::el6httpd24-httpd-manualbefore 0:2.4.34-7.el6.10:2.4.34-7.el6.1
Red Hat:rhel_software_collections:3::el6httpd24-httpd-toolsbefore 0:2.4.34-7.el6.10:2.4.34-7.el6.1
Red Hat:rhel_software_collections:3::el6httpd24-mod_ldapbefore 0:2.4.34-7.el6.10:2.4.34-7.el6.1
Red Hat:rhel_software_collections:3::el6httpd24-mod_proxy_htmlbefore 1:2.4.34-7.el6.11:2.4.34-7.el6.1
Red Hat:rhel_software_collections:3::el6httpd24-mod_sessionbefore 0:2.4.34-7.el6.10:2.4.34-7.el6.1
Red Hat:rhel_software_collections:3::el6httpd24-mod_sslbefore 1:2.4.34-7.el6.11:2.4.34-7.el6.1
Red Hat:rhel_software_collections:3::el7httpd24-httpdbefore 0:2.4.34-7.el7.10:2.4.34-7.el7.1
Red Hat:rhel_software_collections:3::el7httpd24-httpd-debuginfobefore 0:2.4.34-7.el7.10:2.4.34-7.el7.1
Red Hat:rhel_software_collections:3::el7httpd24-httpd-develbefore 0:2.4.34-7.el7.10:2.4.34-7.el7.1
Red Hat:rhel_software_collections:3::el7httpd24-httpd-manualbefore 0:2.4.34-7.el7.10:2.4.34-7.el7.1
Red Hat:rhel_software_collections:3::el7httpd24-httpd-toolsbefore 0:2.4.34-7.el7.10:2.4.34-7.el7.1
Red Hat:rhel_software_collections:3::el7httpd24-mod_auth_mellonbefore 0:0.13.1-2.el7.10:0.13.1-2.el7.1

+6

Same product

mod auth mellon project: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-3877A vulnerability was found in mod_auth_mellon before v0.14.2.
    25Monitor
  • CVE-2019-13038mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the
    24Monitor

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:libapache2-mod-auth-mellon0.14.2-1 · Debian:12Package registry (OSV)
red hat:httpd24-httpd0:2.4.34-7.el6.1 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-httpd-debuginfo0:2.4.34-7.el6.1 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-httpd-devel0:2.4.34-7.el6.1 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-httpd-manual0:2.4.34-7.el6.1 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-httpd-tools0:2.4.34-7.el6.1 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-mod_auth_mellon0:0.13.1-2.el7.1 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:httpd24-mod_auth_mellon-debuginfo0:0.13.1-2.el7.1 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:httpd24-mod_ldap0:2.4.34-7.el6.1 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-mod_md0:2.4.34-7.el7.1 · Red Hat:rhel_software_collections:3::el7Package registry (OSV)
red hat:httpd24-mod_proxy_html1:2.4.34-7.el6.1 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-mod_session0:2.4.34-7.el6.1 · Red Hat:rhel_software_collections:3::el6Package registry (OSV)
red hat:httpd24-mod_ssl1:2.4.34-7.el6.1 · Red Hat:rhel_software_collections:3::el6Package 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).

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.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-305 · Authentication Bypass by Primary Weakness

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records