CVE-2019-16378

OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 is prone to a signature-bypass...

9.8 CriticalFix available

OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 is prone to a signature-bypass vulnerability with multiple From: addresses, which might affect applications that consider a domain name to be relevant to the origin of an e-mail message.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.46%Up 0.2 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2019-16378
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-290
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-16378
Updated: 2026-11-02

EUVDEUVD-2019-7131 No score

Record: EUVD-2019-7131
Updated: 2026-11-03

GitHub AdvisoriesGHSA-x9f6-xw7x-fm76 9.8

OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 is prone to a signature-bypass...

Record: GHSA-x9f6-xw7x-fm76
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-290
Updated: 2026-11-02

OSV 9.8

Record: CVE-2019-16378
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2019-16378 9.8

Record: DEBIAN-CVE-2019-16378
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2019-16378 9.8

Record: UBUNTU-CVE-2019-16378
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUSN-4567-1 No score

opendmarc vulnerability

It was discovered that OpenDMARC is prone to a signature-bypass vulnerability with multiple "From:" addresses. An attacker could use it to bypass spam and abuse filters.

Record: USN-4567-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`opendmarc` Debian:12	before 1.3.2-7	1.3.2-7
`opendmarc` Debian:13	before 1.3.2-7	1.3.2-7
`opendmarc` Debian:14	before 1.3.2-7	1.3.2-7
`opendmarc` Debian:9	before 1.3.2-2+deb9u2, plus listed versions 1.3.2-21.3.2-2+deb9u11.3.2-2+deb9u1~bpo8+1	1.3.2-2+deb9u2
`opendmarc` Debian:10	before 1.3.2-6+deb10u1, plus listed versions 1.3.2-6	1.3.2-6+deb10u1
`opendmarc` Ubuntu:18.04:LTS	before 1.3.2-3ubuntu0.1, plus listed versions 1.3.2-21.3.2-3	1.3.2-3ubuntu0.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-16378 is a critical vulnerability (CVSS 9.8) in Trusteddomain Opendmarc, published September 17, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.46%, the 84th percentile. Fixed in opendmarc 1.3.2-7.

References

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