What’s Vulnerable › Vulnerabilities

CVE-2020-36519

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-16 · updated 2026-06-17

Description

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.)

Affected products

• Mimecast Email Security: before 2020-01-10 — fixed in 2020-01-10

How to fix

Upgrade to a fixed version: Mimecast Email Security 2020-01-10. Check the vendor advisory for mitigations.

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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