CVE-2025-43892: A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS

Q: How do I fix CVE-2025-43892?

fortiproxy: upgrade to newer than 7.6.5; fortios: upgrade to newer than 7.6.2. Exact commands for each OS are on this page.

Q: Is CVE-2025-43892 being exploited?

CVE-2025-43892 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-2025-43892 affect?

CVE-2025-43892 affects fortiproxy, fortios. Severity is medium (CVSS 4.3). A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions may allow an authenticated remote attacker to return a porti

Q: How urgent is CVE-2025-43892?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADEUPGRADE

CVE-2025-43892 is a medium-severity flaw (CVSS 4.3) affecting fortiproxy, fortios. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions may allow an authenticated remote attacker to return a portion of device memory in the redirect response via submitting a specially crafted request.

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	Low
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-126
Published	2026-07-14
Last modified	2026-09-29

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

Last updated 2026-09-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 16:16 UTCPublished CVE record published
2026-09-29 14:10 UTCUpdated Record last modified

fortinet fortiproxy UPGRADE

Affected: >= 7.2.0 and <= 7.2.15 · >= 7.4.0 and <= 7.4.13 · >= 7.6.0 and <= 7.6.5

Fixed in: newer than 7.6.5

Safe to downgrade to: a release before 7.2.0

1. Check installed version

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

2. UPGRADE to newer than 7.6.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortiproxy

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 7.2.0 (Debian / Ubuntu)

apt-cache madison fortiproxy sudo apt install fortiproxy=<VERSION_BEFORE_7.2.0> sudo apt-mark hold fortiproxy

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

dnf --showduplicates list fortiproxy sudo dnf downgrade fortiproxy-<VERSION_BEFORE_7.2.0> sudo dnf versionlock add fortiproxy

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 fortios UPGRADE

Affected: >= 7.2.0 and <= 7.2.13 · >= 7.4.0 and <= 7.4.8 · >= 7.6.0 and <= 7.6.2

Fixed in: newer than 7.6.2

Safe to downgrade to: a release before 7.2.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2025-43892?

fortiproxy: upgrade to newer than 7.6.5; fortios: upgrade to newer than 7.6.2. Exact commands for each OS are on this page.

Is CVE-2025-43892 being exploited?

CVE-2025-43892 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-2025-43892 affect?

CVE-2025-43892 affects fortiproxy, fortios. Severity is medium (CVSS 4.3). A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions may allow an authenticated remote attacker to return a porti

How urgent is CVE-2025-43892?

Priority 23/100. No elevated risk signals yet.

Software pages

Fortinet FortiOS vulnerabilities · Fortinet vulnerabilities

Related CVEs

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References

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