CVE-2022-23439: A externally controlled reference to a resource in another sphere vulnerability in Fortinet allows attacker t

Routine

MEDIUM 4.7UPGRADEUPGRADEUPGRADE

CVE-2022-23439 is a medium-severity flaw (CVSS 4.7) affecting fortiadc, fortiauthenticator, fortiddos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A externally controlled reference to a resource in another sphere vulnerability in Fortinet allows attacker to poison web caches via crafted HTTP requests, where the `Host` header points to an arbitrary webserver

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-610
Published	2025-01-22
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2025-01-22 10:15 UTCPublished CVE record published
2026-06-17 04:30 UTCUpdated Record last modified

fortinet fortiadc UPGRADE

Affected: >= 5.4.0 and < 6.2.4

Fixed in: 6.2.4

Safe to downgrade to: a release before 5.4.0

1. Check installed version

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

2. UPGRADE to 6.2.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortiadc

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 5.4.0 (Debian / Ubuntu)

apt-cache madison fortiadc sudo apt install fortiadc=<VERSION_BEFORE_5.4.0> sudo apt-mark hold fortiadc

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

dnf --showduplicates list fortiadc sudo dnf downgrade fortiadc-<VERSION_BEFORE_5.4.0> sudo dnf versionlock add fortiadc

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.

fortinet fortiauthenticator UPGRADE

Affected: >= 6.3.0 and < 6.3.4 · >= 6.4.0 and < 6.4.2

Fixed in: 6.3.4, 6.4.2

Safe to downgrade to: a release before 6.3.0

1. Check installed version

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

2. UPGRADE to 6.3.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortiauthenticator

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 6.3.0 (Debian / Ubuntu)

apt-cache madison fortiauthenticator sudo apt install fortiauthenticator=<VERSION_BEFORE_6.3.0> sudo apt-mark hold fortiauthenticator

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

dnf --showduplicates list fortiauthenticator sudo dnf downgrade fortiauthenticator-<VERSION_BEFORE_6.3.0> sudo dnf versionlock add fortiauthenticator

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.

fortinet fortiddos UPGRADE

Affected: >= 5.3.0 and < 5.5.2

Fixed in: 5.5.2

Safe to downgrade to: a release before 5.3.0

1. Check installed version

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

2. UPGRADE to 5.5.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortiddos

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 5.3.0 (Debian / Ubuntu)

apt-cache madison fortiddos sudo apt install fortiddos=<VERSION_BEFORE_5.3.0> sudo apt-mark hold fortiddos

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

dnf --showduplicates list fortiddos sudo dnf downgrade fortiddos-<VERSION_BEFORE_5.3.0> sudo dnf versionlock add fortiddos

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.

fortinet fortiddos-f UPGRADE

Affected: >= 6.1.0 and < 6.3.4

Fixed in: 6.3.4

Safe to downgrade to: a release before 6.1.0

1. Check installed version

apt-cache policy fortiddos-f || rpm -q fortiddos-f || fortiddos-f --version

2. UPGRADE to 6.3.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fortiddos-f

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortiddos-f

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 6.1.0 (Debian / Ubuntu)

apt-cache madison fortiddos-f sudo apt install fortiddos-f=<VERSION_BEFORE_6.1.0> sudo apt-mark hold fortiddos-f

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

dnf --showduplicates list fortiddos-f sudo dnf downgrade fortiddos-f-<VERSION_BEFORE_6.1.0> sudo dnf versionlock add fortiddos-f

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.

fortinet fortimail UPGRADE

Affected: >= 6.4.0 and < 7.0.4

Fixed in: 7.0.4

Safe to downgrade to: a release before 6.4.0

1. Check installed version

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

2. UPGRADE to 7.0.4 (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 6.4.0 (Debian / Ubuntu)

apt-cache madison fortimail sudo apt install fortimail=<VERSION_BEFORE_6.4.0> 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_6.4.0> 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.

fortinet fortindr UPGRADE

Affected: >= 1.4.0 and < 7.1.1 · 7.2.0

Fixed in: 7.1.1

Safe to downgrade to: a release before 1.4.0

1. Check installed version

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

2. UPGRADE to 7.1.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortindr

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 1.4.0 (Debian / Ubuntu)

apt-cache madison fortindr sudo apt install fortindr=<VERSION_BEFORE_1.4.0> sudo apt-mark hold fortindr

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

dnf --showduplicates list fortindr sudo dnf downgrade fortindr-<VERSION_BEFORE_1.4.0> sudo dnf versionlock add fortindr

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-2022-23439?

fortiadc: upgrade to 6.2.4; fortiauthenticator: upgrade to 6.3.4, 6.4.2; fortiddos: upgrade to 5.5.2. Exact commands for each OS are on this page.

Is CVE-2022-23439 being exploited?

CVE-2022-23439 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-2022-23439 affect?

CVE-2022-23439 affects fortiadc, fortiauthenticator, fortiddos. Severity is medium (CVSS 4.7). A externally controlled reference to a resource in another sphere vulnerability in Fortinet allows attacker to poison web caches via crafted HTTP requests, where the `Host` header points to an arbitrary webserver

How urgent is CVE-2022-23439?

Priority 26/100. No elevated risk signals yet.

Software pages

Fortinet vulnerabilities

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References

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