CVE-2019-20790

Published: Apr 27, 2020Modified: Jun 17, 2026

9.8

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 3.9 / Impact: 5.9

Source: NVD

Description

OpenDMARC through 1.3.2 and 1.4.x, when used with pypolicyd-spf 2.0.2, allows attacks that bypass SPF and DMARC authentication in situations where the HELO field is inconsistent with the MAIL FROM field.

Affected (5)

Products: Trusteddomain: Opendmarc · Pypolicyd Spf Project: Pypolicyd Spf · Fedoraproject: Fedora

Trusteddomain

1 product

Opendmarc

Pypolicyd Spf Project

1 product

Pypolicyd Spf

Fedoraproject

1 product

Fedora

Configuration A

3 vulnerable

Vulnerable Software	Affected Versions
Trusteddomain Opendmarc	From 1.3.0 to 1.3.2
Trusteddomain Opendmarc	Version 1.4.0
Pypolicyd Spf Project Pypolicyd Spf	Version 2.0.2

Configuration B

2 vulnerable

Vulnerable Software	Affected Versions
Fedoraproject Fedora	Version 33
Fedoraproject Fedora	Version 34

Related CWEs

CWE-290

Authentication Bypass by Spoofing

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

References (10)

https://bugs.launchpad.net/pypolicyd-spf/+bug/1838816

Source: cve@mitre.org

ExploitThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2D4JGHMALEJEWWG56DKR5OZB22TK7W5B/

Source: cve@mitre.org

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KBOGOQOK3TIWWJV66MW5YWNRJAFFYGR5/

Source: cve@mitre.org

https://sourceforge.net/p/opendmarc/tickets/235/

Source: cve@mitre.org

ExploitThird Party Advisory

https://www.usenix.org/system/files/sec20fall_chen-jianjun_prepub_0.pdf

Source: cve@mitre.org

Technical DescriptionThird Party Advisory

https://bugs.launchpad.net/pypolicyd-spf/+bug/1838816