CVE-2019-20790

CRITICAL

OpenDMARC <= 1.3.2 and 1.4.x - Authentication Bypass via HELO/MAIL FROM Inconsistency

Title source: llm

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.

References (5)

Core 5

Core References

Technical Description, Third Party Advisory x_refsource_misc

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

Exploit, Third Party Advisory x_refsource_misc

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

Exploit, Third Party Advisory x_refsource_misc

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

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

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

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

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

Scores

CVSS v3 9.8

EPSS 0.0266

EPSS Percentile 83.7%

Attack Vector NETWORK

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

Details

CWE

CWE-290

Status published

Products (5)

fedoraproject/fedora 33

fedoraproject/fedora 34

pypolicyd-spf_project/pypolicyd-spf 2.0.2

trusteddomain/opendmarc 1.4.0

trusteddomain/opendmarc 1.3.0 - 1.3.2

Published Apr 27, 2020

Tracked Since Feb 18, 2026