TI-2020-18754 Aliases CVE-2020-36519 GHSA-2x44-42qx-w2fx

Mimecast Email Security before 2020-01-10 allows any admin to spoof any domain, and pass…

LOW 24Published 2022-03-15 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.)

Why it matters now

EPSS 0.00815 57th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mimecast:email_security::::::::	before 2020-01-10	Vulnerable	Mimecast

cpe:2.3:a:mimecast:email_security:*:*:*:*:*:*:*:* Versions before 2020-01-10 Vulnerable ·Mimecast

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-36519
2026-10-03 Alias added: GHSA-2x44-42qx-w2fx

References

Exploit 1

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

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences