PatchTheCVECVE-2021-24008: An exposure of sensitive system information to an unauthorized control sphere vulnerability [CWE-497] in Forti
34
Routine
MEDIUM 5.3REMOTEUPGRADEUPGRADEUPGRADE
CVE-2021-24008 is a medium-severity flaw (CVSS 5.3) affecting fortimail, fortiddos, fortivoice. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An exposure of sensitive system information to an unauthorized control sphere vulnerability [CWE-497] in FortiDDoS version 5.4.0, version 5.3.2 and below, version 5.2.0, version 5.1.0, version 5.0.0, version 4.7.0, version 4.6.0, version 4.5.0, version 4.4.2 and below, FortiDDoS-CM version 5.3.0, version 5.2.0, version 5.1.0, version 5.0.0, version 4.7.0, FortiVoice version 6.0.6 and below, FortiRecorder version 6.0.3 and below and FortiMail vers
Why this priority
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.5% (top 57%) |
| CISA exploited list | No |
| Weakness | CWE-200 |
| Published | 2025-03-28 |
| 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
- Published CVE record published
- Updated Record last modified
fortinet fortimail UPGRADE
Affected: >= 6.0.0 and < 6.0.10 · >= 6.2.0 and < 6.2.5 · >= 6.4.0 and < 6.4.2
Fixed in: 6.0.10, 6.2.5, 6.4.2
Safe to downgrade to: a release before 6.0.0
1. Check installed version
apt-cache policy fortimail || rpm -q fortimail || fortimail --version
2. UPGRADE to 6.0.10 (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 6.0.0 (Debian / Ubuntu)
apt-cache madison fortimail
sudo apt install fortimail=<VERSION_BEFORE_6.0.0>
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_6.0.0>
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.
fortinet fortiddos UPGRADE
Affected: >= 4.4.0 and < 5.4.3
Fixed in: 5.4.3
Safe to downgrade to: a release before 4.4.0
1. Check installed version
apt-cache policy fortiddos || rpm -q fortiddos || fortiddos --version
2. UPGRADE to 5.4.3 (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 4.4.0 (Debian / Ubuntu)
apt-cache madison fortiddos
sudo apt install fortiddos=<VERSION_BEFORE_4.4.0>
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_4.4.0>
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 fortivoice UPGRADE
Affected: >= 6.0.0 and < 6.0.7
Fixed in: 6.0.7
Safe to downgrade to: a release before 6.0.0
1. Check installed version
apt-cache policy fortivoice || rpm -q fortivoice || fortivoice --version
2. UPGRADE to 6.0.7 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade fortivoice
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade fortivoice
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 6.0.0 (Debian / Ubuntu)
apt-cache madison fortivoice
sudo apt install fortivoice=<VERSION_BEFORE_6.0.0>
sudo apt-mark hold fortivoice
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list fortivoice
sudo dnf downgrade fortivoice-<VERSION_BEFORE_6.0.0>
sudo dnf versionlock add fortivoice
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 fortirecorder UPGRADE
Affected: >= 6.0.0 and < 6.0.4
Fixed in: 6.0.4
Safe to downgrade to: a release before 6.0.0
1. Check installed version
apt-cache policy fortirecorder || rpm -q fortirecorder || fortirecorder --version
2. UPGRADE to 6.0.4 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade fortirecorder
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade fortirecorder
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 6.0.0 (Debian / Ubuntu)
apt-cache madison fortirecorder
sudo apt install fortirecorder=<VERSION_BEFORE_6.0.0>
sudo apt-mark hold fortirecorder
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list fortirecorder
sudo dnf downgrade fortirecorder-<VERSION_BEFORE_6.0.0>
sudo dnf versionlock add fortirecorder
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-cm DOWNGRADE
Affected: 4.7.0 · 5.0.0 · 5.1.0 · 5.2.0 · 5.3.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 4.7.0
1. Check installed version
apt-cache policy fortiddos-cm || rpm -q fortiddos-cm || fortiddos-cm --version
2. No fixed release: DOWNGRADE to a release before 4.7.0 (Debian / Ubuntu)
apt-cache madison fortiddos-cm
sudo apt install fortiddos-cm=<VERSION_BEFORE_4.7.0>
sudo apt-mark hold fortiddos-cm
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list fortiddos-cm
sudo dnf downgrade fortiddos-cm-<VERSION_BEFORE_4.7.0>
sudo dnf versionlock add fortiddos-cm
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.
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-2021-24008?
fortimail: upgrade to 6.0.10, 6.2.5, 6.4.2; fortiddos: upgrade to 5.4.3; fortivoice: upgrade to 6.0.7. Exact commands for each OS are on this page.
Is CVE-2021-24008 being exploited?
CVE-2021-24008 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-2021-24008 affect?
CVE-2021-24008 affects fortimail, fortiddos, fortivoice. Severity is medium (CVSS 5.3). An exposure of sensitive system information to an unauthorized control sphere vulnerability [CWE-497] in FortiDDoS version 5.4.0, version 5.3.2 and below, version 5.2.0, version 5.1.0, version 5.0.0, version 4.7.0, version 4.6.0, version 4.
How urgent is CVE-2021-24008?
Priority 34/100. Remotely exploitable, no login, no user action
Software pages
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