CVE-2025-54972: An improper neutralization of crlf sequences ('crlf injection') vulnerability in Fortinet FortiMail 7.6.0 thro

Routine

MEDIUM 4.3UPGRADE

CVE-2025-54972 is a medium-severity flaw (CVSS 4.3) affecting fortimail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An improper neutralization of crlf sequences ('crlf injection') vulnerability in Fortinet FortiMail 7.6.0 through 7.6.3, FortiMail 7.4.0 through 7.4.5, FortiMail 7.2 all versions, FortiMail 7.0 all versions may allow an attacker to inject headers in the response via convincing a user to click on a specifically crafted link

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-93
Published	2025-11-18
Last modified	2026-10-18

Publisher (CNA): Fortinet, Inc. · Vendor: fortinet

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-18 17:16 UTCPublished CVE record published
2026-10-18 20:10 UTCUpdated Record last modified

fortinet fortimail UPGRADE

Affected: >= 7.0.0 and < 7.4.6 · >= 7.6.0 and < 7.6.4

Fixed in: 7.4.6, 7.6.4

Safe to downgrade to: a release before 7.0.0

1. Check installed version

apt-cache policy fortimail || rpm -q fortimail || fortimail --version

2. UPGRADE to 7.4.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fortimail

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortimail

Note

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

3. If no update is available yet, DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison fortimail sudo apt install fortimail=<VERSION_BEFORE_7.0.0> sudo apt-mark hold fortimail

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fortimail sudo dnf downgrade fortimail-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add fortimail

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-54972?

fortimail: upgrade to 7.4.6, 7.6.4. Exact commands for each OS are on this page.

Is CVE-2025-54972 being exploited?

CVE-2025-54972 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-2025-54972 affect?

CVE-2025-54972 affects fortimail. Severity is medium (CVSS 4.3). An improper neutralization of crlf sequences ('crlf injection') vulnerability in Fortinet FortiMail 7.6.0 through 7.6.3, FortiMail 7.4.0 through 7.4.5, FortiMail 7.2 all versions, FortiMail 7.0 all versions may allow an attacker to inject h

How urgent is CVE-2025-54972?

Priority 18/100. No elevated risk signals yet.

Software pages

Fortinet vulnerabilities

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References

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