Is CVE-2019-3878 in the CISA KEV catalog?

No. CVE-2019-3878 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-3878?

CVE-2019-3878 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2019-3878?

CVE-2019-3878 has an EPSS score of 2.97% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-3878?

Upgrade libapache2-mod-auth-mellon on debian 11 to 0.14.2-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2019-3878

HIGHEPSS 86th pctl

8.1

CVSS v3

NVD

Description

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.

CWE-305 CWE-287Improper Authentication

How to fix

Remediation Available

libapache2-mod-auth-mellonDebian

Fixed in:0.14.2-1CVE-2019-3878

libapache2-mod-auth-mellonUbuntu

Fixed in:0.12.0-2+deb9u1build0.16.04.1USN-4597-1

Fixed in:0.13.1-1ubuntu0.1USN-3924-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

2.97%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch2

Third-Party Advisory3

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.