CVE-2020-36519

4.9 mediumEPSS 0.8%

Medium (4.9) in mimecast email security. EPSS 0.8% chance of exploitation in the next 30 days.

Mimecast Email Security before 2020-01-10 allows any admin to spoof any domain, and pass DMARC alignment via SPF. This occurs through misuse of the address rewrite feature. (The domain being spoofed must be a customer in the Mimecast grid from which the spoofing occurs.)

Severity

CVSS 3.1

4.9 medium

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

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
Published: 2022-03-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mimecast:email_security

References

https://wesleyk.me/2020/01/10/my-first-vulnerability-mimecast-sender-address-verification/
https://wesleyk.me/2020/01/10/my-first-vulnerability-mimecast-sender-address-verification/

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