CVE-2025-25252 Auth bypass in FortiOS

What is CVE-2025-25252?

CVE-2025-25252 is a medium-severity authentication bypass vulnerability in Fortinet Fortios, published on 14 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Insufficient Session Expiration vulnerability [CWE-613] in FortiOS SSL VPN 7.6.0 through 7.6.2, 7.4.0 through 7.4.6, 7.2.0 through 7.2.10, 7.0.0 through 7.0.16, 6.4 all versions may allow a remote attacker (e.g. a former admin whose account was removed and whose session was terminated) in possession of the SAML record of a user session to access or re-open that session via re-use of SAML record.

Weakness: CWE-613

Which versions are affected by CVE-2025-25252?

It affects 1 product.

Products include Fortinet Fortios.

How do I fix CVE-2025-25252?

No fix has been published for CVE-2025-25252 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2025-25252 being exploited?

There is no known exploitation of CVE-2025-25252 in the wild and no public exploit code.

Other vulnerabilities in Fortinet Fortios

• CVE-2024-23113 Fortinet Multiple Products Format String Exploited Critical 9.8
• CVE-2022-40684 Fortinet Multiple Products Authentication Bypass Exploited Critical 9.8
• CVE-2024-55591 Fortinet FortiOS and FortiProxy Authentication Bypass Exploited Critical 9.6
• CVE-2024-21762 Fortinet FortiOS Out-of-Bound Write Exploited Critical 9.6
• CVE-2022-42475 Fortinet FortiOS Heap-Based Buffer Overflow Exploited Critical 9.3

All Fortinet Fortios vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8vxf-42v3-rc9p.