CVE-2019-20790
CRITICALCVSS 9.8/10EPSS 2.66%
Last modified
CVE-2019-20790 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 2.66% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Trusteddomain | Opendmarc | >= 1.3.0, <= 1.3.2 |
| Trusteddomain | Opendmarc | 1.4.0 |
| Pypolicyd-Spf Project | Pypolicyd-Spf | 2.0.2 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
References
- https://bugs.launchpad.net/pypolicyd-spf/+bug/1838816Exploit, Third Party Advisory
- https://sourceforge.net/p/opendmarc/tickets/235/Exploit, Third Party Advisory
- https://www.usenix.org/system/files/sec20fall_chen-jianjun_prepub_0.pdfTechnical Description, Third Party Advisory
- https://bugs.launchpad.net/pypolicyd-spf/+bug/1838816Exploit, Third Party Advisory
- https://sourceforge.net/p/opendmarc/tickets/235/Exploit, Third Party Advisory
- https://www.usenix.org/system/files/sec20fall_chen-jianjun_prepub_0.pdfTechnical Description, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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 score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.66% probability of exploitation in the next 30 days.
How do I fix CVE-2019-20790?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
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Are you affected by CVE-2019-20790?
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