Email Security
CVE-2020-36519: Mimecast Email Security before 2020-01-10 allows any admin to spoof any domain, and pass DMARC alignment vi…
Mimecast Email Security before 2020-01-10 allows any admin to spoof any domain, and pass DMARC alignment via SPF.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityUnknown
EPSS0.81%Chance of exploitation in 30 days
Public exploitNot tracked
FixSee advisory
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| n/a n/a | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.)
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.