How severe is CVE-2019-20790?

CVE-2019-20790 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-20790 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20790?

CVE-2019-20790 primarily affects Trusteddomain Opendmarc. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-20790?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-20790 published?

CVE-2019-20790 was published on 2020-04-27 and last updated on 2026-06-17.

CVE-2019-20790

CVE-2019-20790 is a critical-severity vulnerability in Trusteddomain Opendmarc with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-290.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 6.8
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-290
Affected product: Trusteddomain Opendmarc
Published: 2020-04-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-20790?: 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.
How severe is CVE-2019-20790?: CVE-2019-20790 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-20790 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20790?: CVE-2019-20790 primarily affects Trusteddomain Opendmarc. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-20790?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-20790 published?: CVE-2019-20790 was published on 2020-04-27 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:trusteddomain:opendmarc:*:*:*:*:*:*:*:*
cpe:2.3:a:trusteddomain:opendmarc:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:pypolicyd-spf_project:pypolicyd-spf:2.0.2:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

More vulnerabilities in Trusteddomain Opendmarc

CVE-2020-12460 — Critical (CVSS 9.8): OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 has improper null termination in the function opendmarc_xml_parse…
CVE-2019-16378 — Critical (CVSS 9.8): OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 is prone to a signature-bypass vulnerability with multiple From:…
CVE-2024-25768 — High (CVSS 7.5): OpenDMARC 1.4.2 contains a null pointer dereference vulnerability in /OpenDMARC/libopendmarc/opendmarc_policy.c.
CVE-2021-34555 — High (CVSS 7.5): OpenDMARC 1.4.1 and 1.4.1.1 allows remote attackers to cause a denial of service (NULL pointer dereference and…
CVE-2020-12272 — Medium (CVSS 5.3): OpenDMARC through 1.3.2 and 1.4.x allows attacks that inject authentication results to provide false information about…

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