CVE-2025-62631 Auth bypass in FortiOS

What is CVE-2025-62631?

CVE-2025-62631 is a medium-severity authentication bypass vulnerability in Fortinet Fortios, published on 9 Dec 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] vulnerability in Fortinet FortiOS 7.4.0, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions allows attacker to maintain access to network resources via an active SSLVPN session not terminated after a user's password change under particular conditions outside of the attacker's control

Weakness: CWE-613

Which versions are affected by CVE-2025-62631?

It affects 1 product.

Products include Fortinet Fortios.

How do I fix CVE-2025-62631?

No fix has been published for CVE-2025-62631 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-2025-62631 being exploited?

There is no known exploitation of CVE-2025-62631 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-chj4-wrc6-847j.