Cyber Resilience

CVE-2024-33507

Fortinet Fortiisolator 2.3.0 – 2.4.5

Published
14 October 2025
Modified
15 October 2025
Patch / advisory
View advisory
CVSS Score v3.1 7.4
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS Score 0.0037 29th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2024-33507 is a high-severity Insufficient Session Expiration (CWE-613) vulnerability in Fortinet Fortiisolator. Its CVSS base score is 7.4 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Browser Session Hijacking (T1185); ranked at the 29th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-12 (Session Termination) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2024-33507 involves an insufficient session expiration vulnerability (CWE-613) and an incorrect authorization vulnerability (CWE-863) in the authentication mechanism of FortiIsolator. The affected versions include 2.4.0 through 2.4.4, all versions of 2.3, 2.2.0, all versions of 2.1, and all versions of 2.0. The vulnerability carries a CVSS v3.1 base score of 7.4 (High), with a vector of AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H.

A remote unauthenticated attacker can exploit this to deauthenticate currently logged-in administrators by sending a crafted cookie. Separately, a remote authenticated attacker with read-only privileges can leverage a crafted cookie to gain elevated write privileges.

Mitigation details are available in the Fortinet PSIRT advisory at https://fortiguard.fortinet.com/psirt/FG-IR-24-062.

OWASP Top 10 for Web (2025)

A07:2025 Authentication Failures

EU & UK References

Vulnerability Data

An insufficient session expiration vulnerability [CWE-613] and an incorrect authorization vulnerability [CWE-863] in FortiIsolator 2.4.0 through 2.4.4, 2.3 all versions, 2.2.0, 2.1 all versions, 2.0 all versions authentication mechanism may allow remote unauthenticated attacker to deauthenticate logged in admins via…

more

crafted cookie and remote authenticated read-only attacker to gain write privilege via crafted cookie.

CWE(s)
CWE-613

Related Threats

MITRE ATT&CK Enterprise Techniques

T1185 Browser Session Hijacking Collection
Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.
attack.mitre.org →
T1550 Use Alternate Authentication Material Lateral Movement
Adversaries may use alternate authentication material, such as password hashes, Kerberos tickets, and application access tokens, in order to move laterally within an environment and bypass normal system access controls.
attack.mitre.org →
T1550.004 Web Session Cookie Lateral Movement
Adversaries can use stolen session cookies to authenticate to web applications and services.
attack.mitre.org →
T1563 Remote Service Session Hijacking Lateral Movement
Adversaries may take control of preexisting sessions with remote services to move laterally in an environment.
attack.mitre.org →
T1539 Steal Web Session Cookie Credential Access
An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-27779Same product: Fortinet Fortiisolator
CVE-2024-54025Same product: Fortinet Fortiisolator
CVE-2024-27782Same vendor: Fortinet
CVE-2024-32124Same product: Fortinet Fortiisolator
CVE-2023-28001Same vendor: Fortinet
CVE-2025-25252Same vendor: Fortinet
CVE-2024-55590Same product: Fortinet Fortiisolator
CVE-2023-33303Same vendor: Fortinet
CVE-2025-62631Same vendor: Fortinet
CVE-2024-54024Same product: Fortinet Fortiisolator

Affected Assets

fortinet
fortiisolator
2.3.0 — 2.4.5

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

AC-12 Session Termination good match

AC-12 directly requires automatic session termination after a defined period, structurally preventing reuse of expired session identifiers.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-01 mostly match
prevents

Credential lifecycle management directly includes enforcing session expiration to prevent reuse.

PR.AA-05 mostly match
prevents

Authorization policy enforcement and review covers terminating stale sessions to limit access scope.

PR.AA-03 partial match
prevents

Authentication mechanisms can incorporate session timeout checks but do not inherently address expiration policy.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.5 Secure authentication none match
none

Automatic termination of inactive sessions and limits on connection duration shrink the window during which a hijacked or unattended authenticated session can be exploited.

References