PatchTheCVECVE-2023-25610: A buffer underwrite ('buffer underflow') vulnerability in the administrative interface of Fortinet FortiOS ver
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CRITICAL 9.8REMOTEUPGRADEUPGRADEUPGRADE
CVE-2023-25610 is a critical-severity flaw (CVSS 9.8) affecting fortiweb, fortiswitchmanager, fortiswitch. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A buffer underwrite ('buffer underflow') vulnerability in the administrative interface of Fortinet FortiOS version 7.2.0 through 7.2.3, version 7.0.0 through 7.0.6, version 6.4.0 through 6.4.11 and version 6.2.12 and below, FortiProxy version 7.2.0 through 7.2.2, version 7.0.0 through 7.0.8, version 2.0.12 and below and FortiOS-6K7K version 7.0.5, version 6.4.0 through 6.4.10 and version 6.2.0 through 6.2.10 and below allows a remote unauthentica
Why this priority
- Critical severity
- EPSS top 3%: very likely to be exploited
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 18.3% (top 3%) |
| CISA exploited list | No |
| Weakness | CWE-124 |
| Published | 2025-03-24 |
| 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 fortiweb UPGRADE
Affected: >= 6.1.0 and < 6.1.4 · >= 6.2.0 and < 6.2.8 · >= 6.3.0 and < 6.3.23 · >= 6.4.0 and < 6.4.3 · >= 7.0.0 and < 7.0.7 · >= 7.2.0 and < 7.2.2
Fixed in: 6.1.4, 6.2.8, 6.3.23, 6.4.3, 7.0.7, 7.2.2
Safe to downgrade to: a release before 6.1.0
1. Check installed version
apt-cache policy fortiweb || rpm -q fortiweb || fortiweb --version
2. UPGRADE to 6.1.4 (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 6.1.0 (Debian / Ubuntu)
apt-cache madison fortiweb
sudo apt install fortiweb=<VERSION_BEFORE_6.1.0>
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_6.1.0>
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.
fortinet fortiswitchmanager UPGRADE
Affected: >= 7.0.0 and < 7.0.2 · >= 7.2.0 and < 7.2.2
Fixed in: 7.0.2, 7.2.2
Safe to downgrade to: a release before 7.0.0
1. Check installed version
apt-cache policy fortiswitchmanager || rpm -q fortiswitchmanager || fortiswitchmanager --version
2. UPGRADE to 7.0.2 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade fortiswitchmanager
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade fortiswitchmanager
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 7.0.0 (Debian / Ubuntu)
apt-cache madison fortiswitchmanager
sudo apt install fortiswitchmanager=<VERSION_BEFORE_7.0.0>
sudo apt-mark hold fortiswitchmanager
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list fortiswitchmanager
sudo dnf downgrade fortiswitchmanager-<VERSION_BEFORE_7.0.0>
sudo dnf versionlock add fortiswitchmanager
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 fortiswitch UPGRADE
Affected: >= 7.0.0 and < 7.0.7 · >= 7.2.0 and < 7.2.4
Fixed in: 7.0.7, 7.2.4
Safe to downgrade to: a release before 7.0.0
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.
fortinet fortiproxy UPGRADE
Affected: >= 1.1.0 and < 7.0.9 · >= 7.2.0 and < 7.2.3
Fixed in: 7.0.9, 7.2.3
Safe to downgrade to: a release before 1.1.0
1. Check installed version
apt-cache policy fortiproxy || rpm -q fortiproxy || fortiproxy --version
2. UPGRADE to 7.0.9 (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 1.1.0 (Debian / Ubuntu)
apt-cache madison fortiproxy
sudo apt install fortiproxy=<VERSION_BEFORE_1.1.0>
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_1.1.0>
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-6k7k UPGRADE
Affected: >= 6.0.4 and < 6.2.13 · >= 6.4.2 and < 6.4.12 · 7.0.5
Fixed in: 6.2.13, 6.4.12
Safe to downgrade to: a release before 6.0.4
1. Check installed version
apt-cache policy fortios-6k7k || rpm -q fortios-6k7k || fortios-6k7k --version
2. UPGRADE to 6.2.13 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade fortios-6k7k
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade fortios-6k7k
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 6.0.4 (Debian / Ubuntu)
apt-cache madison fortios-6k7k
sudo apt install fortios-6k7k=<VERSION_BEFORE_6.0.4>
sudo apt-mark hold fortios-6k7k
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list fortios-6k7k
sudo dnf downgrade fortios-6k7k-<VERSION_BEFORE_6.0.4>
sudo dnf versionlock add fortios-6k7k
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: >= 5.0.0 and < 6.2.13 · >= 6.4.0 and < 6.4.12 · >= 7.0.0 and < 7.0.10 · >= 7.2.0 and < 7.2.4
Fixed in: 6.2.13, 6.4.12, 7.0.10, 7.2.4
Safe to downgrade to: a release before 5.0.0
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.
Exact fixes by distribution
Fedora ELN · ibus-typing-booster · FIXED · 2.31.3-1.eln159 · FEDORA-2026-c895c68d60 · source
sudo dnf upgrade --advisory=FEDORA-2026-c895c68d60
Fedora 46 · perl-WWW-OrangeHRM-Client · FIXED · 0.12.0-21.fc46 · FEDORA-2026-2d14efca09 · source
sudo dnf upgrade --advisory=FEDORA-2026-2d14efca09
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- GitHub PoC: qi4L/CVE-2023-25610 (23 stars)
Advisories and coverage
Official advisories
- IPA Japan Security Alerts: 更新：Fortinet 製 FortiOS および FortiProxy の脆弱性対策について(CVE-2023-25610) 2023-04-11
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-2023-25610?
fortiweb: upgrade to 6.1.4, 6.2.8, 6.3.23, 6.4.3, 7.0.7, 7.2.2; fortiswitchmanager: upgrade to 7.0.2, 7.2.2; fortiswitch: upgrade to 7.0.7, 7.2.4. Exact commands for each OS are on this page.
Is CVE-2023-25610 being exploited?
CVE-2023-25610 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-2023-25610 affect?
CVE-2023-25610 affects fortiweb, fortiswitchmanager, fortiswitch. Severity is critical (CVSS 9.8). A buffer underwrite ('buffer underflow') vulnerability in the administrative interface of Fortinet FortiOS version 7.2.0 through 7.2.3, version 7.0.0 through 7.0.6, version 6.4.0 through 6.4.11 and version 6.2.12 and below, FortiProxy versi
How urgent is CVE-2023-25610?
Priority 72/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action
Software pages
Fortinet FortiOS vulnerabilities · Fortinet vulnerabilities
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