CVE-2020-36519: Mimecast Email Security before 2020-01-10 allows any admin to spoof any domain, and pass DMARC alignment via S

Q: How do I fix CVE-2020-36519?

email security: upgrade to 2020-01-10. Exact commands for each OS are on this page.

Q: Is CVE-2020-36519 being exploited?

CVE-2020-36519 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-36519 affect?

CVE-2020-36519 affects email security. Severity is medium (CVSS 4.9). 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 f

Q: How urgent is CVE-2020-36519?

Priority 36/100. Public exploit reference

Routine

MEDIUM 4.9UPGRADE

CVE-2020-36519 is a medium-severity flaw (CVSS 4.9) affecting email security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Published	2022-03-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mimecast

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-03-16 00:15 UTCPublished CVE record published
2026-06-17 03:15 UTCUpdated Record last modified

mimecast email security UPGRADE

Affected: < 2020-01-10

Fixed in: 2020-01-10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy email-security || rpm -q email-security || email-security --version

2. UPGRADE to 2020-01-10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade email-security

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade email-security

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-36519?

email security: upgrade to 2020-01-10. Exact commands for each OS are on this page.

Is CVE-2020-36519 being exploited?

CVE-2020-36519 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-36519 affect?

CVE-2020-36519 affects email security. Severity is medium (CVSS 4.9). 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 f

How urgent is CVE-2020-36519?

Priority 36/100. Public exploit reference

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References

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