CVE-2023-23783: A use of externally-controlled format string in Fortinet FortiWeb version 7.0.0 through 7.0.1, FortiWeb 6.4 al

Routine

MEDIUM 6.7UPGRADE

CVE-2023-23783 is a medium-severity flaw (CVSS 6.7) affecting fortiweb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A use of externally-controlled format string in Fortinet FortiWeb version 7.0.0 through 7.0.1, FortiWeb 6.4 all versions allows attacker to execute unauthorized code or commands via specially crafted command arguments.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.7 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-134
Published	2023-02-16
Last modified	2026-10-28

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

Last updated 2026-10-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-02-16 19:15 UTCPublished CVE record published
2026-10-28 19:10 UTCUpdated Record last modified

fortinet fortiweb UPGRADE

Affected: >= 6.4.0 and < 6.4.2 · >= 7.0.0 and < 7.0.2

Fixed in: 6.4.2, 7.0.2

Safe to downgrade to: a release before 6.4.0

1. Check installed version

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

2. UPGRADE to 6.4.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortiweb

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 fortiweb sudo apt install fortiweb=<VERSION_BEFORE_6.4.0> sudo apt-mark hold fortiweb

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

dnf --showduplicates list fortiweb sudo dnf downgrade fortiweb-<VERSION_BEFORE_6.4.0> sudo dnf versionlock add fortiweb

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-2023-23783?

fortiweb: upgrade to 6.4.2, 7.0.2. Exact commands for each OS are on this page.

Is CVE-2023-23783 being exploited?

CVE-2023-23783 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-2023-23783 affect?

CVE-2023-23783 affects fortiweb. Severity is medium (CVSS 6.7). A use of externally-controlled format string in Fortinet FortiWeb version 7.0.0 through 7.0.1, FortiWeb 6.4 all versions allows attacker to execute unauthorized code or commands via specially crafted command arguments.

How urgent is CVE-2023-23783?

Priority 28/100. No elevated risk signals yet.

Software pages

Fortinet vulnerabilities

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References

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