Cyber Resilience

CVE-2024-23664

Open Redirect in Fortinet Fortiauthenticator 6.4.0 – 6.5.4

Open Redirect
Published
03 June 2024
Modified
21 January 2025
Patch / advisory
View advisory
CVSS Score v3.1 6.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS Score 0.0035 28th percentile
Risk Priority 46 floored blend · peak EPSS

Summary

CVE-2024-23664 is a medium-severity Open Redirect (CWE-601) vulnerability in Fortinet Fortiauthenticator. Its CVSS base score is 6.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Phishing (T1566); ranked at the 28th 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 SI-10 (Information Input Validation) and AC-4 (Information Flow Enforcement) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

A URL redirection to untrusted site ('open redirect') in Fortinet FortiAuthenticator version 6.6.0, version 6.5.3 and below, version 6.4.9 and below may allow an attacker to to redirect users to an arbitrary website via a crafted URL.

CWE(s)
CWE-601

Related Threats

MITRE ATT&CK Enterprise Techniques

T1566 Phishing Initial Access
Adversaries may send phishing messages to gain access to victim systems.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-47890Same vendor: Fortinet
CVE-2025-59923Same product: Fortinet Fortiauthenticator
CVE-2025-57823Same product: Fortinet Fortiauthenticator
CVE-2026-21743Same product: Fortinet Fortiauthenticator
CVE-2023-22641Same vendor: Fortinet
CVE-2026-44277Same product: Fortinet Fortiauthenticator
CVE-2023-26208Same product: Fortinet Fortiauthenticator
CVE-2026-21741Same vendor: Fortinet
CVE-2025-53379Same product: Fortinet Fortiauthenticator
CVE-2023-46750Shared CWE-601

Affected Assets

fortinet
fortiauthenticator
6.6.0 · 6.4.0 — 6.5.4

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V3.7.2

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

Input validation directly checks and rejects untrusted redirect targets before they are used in a response.

AC-4 Information Flow Enforcement partial match

Information flow enforcement can restrict redirects to only approved/trusted destinations, stopping untrusted user-supplied URLs from being followed.

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.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and untrusted-redirect controls that prevent CWE-601.

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.8.23 Web filtering partial match
mitigates

Preventing access to attacker-controlled or malicious sites stops users from being redirected to untrusted locations via open-redirect or phishing links.

References