CVE-2025-48839: An Out-of-bounds Write vulnerability [CWE-787] in FortiADC 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, 7.

Routine

MEDIUM 6.6UPGRADE

CVE-2025-48839 is a medium-severity flaw (CVSS 6.6) affecting fortiadc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Out-of-bounds Write vulnerability [CWE-787] in FortiADC 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, 7.2 all versions, 7.1 all versions, 7.0 all versions, 6.2 all versions may allow an authenticated attacker to execute arbitrary code via specially crafted HTTP requests.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.6 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-787
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 fortiadc UPGRADE

Affected: >= 6.2.0 and < 7.4.8 · >= 7.6.0 and < 7.6.3 · 8.0.0

Fixed in: 7.4.8, 7.6.3

Safe to downgrade to: a release before 6.2.0

1. Check installed version

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

2. UPGRADE to 7.4.8 (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 6.2.0 (Debian / Ubuntu)

apt-cache madison fortiadc sudo apt install fortiadc=<VERSION_BEFORE_6.2.0> 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_6.2.0> 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.

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-2025-48839?

fortiadc: upgrade to 7.4.8, 7.6.3. Exact commands for each OS are on this page.

Is CVE-2025-48839 being exploited?

CVE-2025-48839 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-2025-48839 affect?

CVE-2025-48839 affects fortiadc. Severity is medium (CVSS 6.6). An Out-of-bounds Write vulnerability [CWE-787] in FortiADC 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, 7.2 all versions, 7.1 all versions, 7.0 all versions, 6.2 all versions may allow an authenticated attacker to execute arbitrary code

How urgent is CVE-2025-48839?

Priority 31/100. No elevated risk signals yet.

Software pages

Fortinet vulnerabilities

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References

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