Cyber Resilience

CVE-2025-64157

Fortinet Fortios 7.0.0 – 7.4.10

Published
10 February 2026
Modified
12 May 2026
Patch / advisory
View advisory
CVSS Score v3.1 6.7
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.014 69th percentile
Risk Priority 52 floored blend · peak EPSS

Summary

CVE-2025-64157 is a medium-severity Use of Externally-Controlled Format String (CWE-134) vulnerability in Fortinet Fortios. Its CVSS base score is 6.7 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 31% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — 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-2025-64157 is a use of externally-controlled format string vulnerability (CWE-134) in Fortinet FortiOS. The affected versions include FortiOS 7.6.0 through 7.6.4, 7.4.0 through 7.4.9, 7.2.0 through 7.2.11, and all versions of FortiOS 7.0. It carries a CVSS v3.1 base score of 6.7 (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H), indicating medium severity with high impacts across confidentiality, integrity, and availability.

An authenticated administrator with local access can exploit the vulnerability by submitting specifically crafted configuration data. Successful exploitation allows execution of unauthorized code or commands on the affected system.

Mitigation details are provided in the Fortinet PSIRT advisory at https://fortiguard.fortinet.com/psirt/FG-IR-25-795.

EU & UK References

Vulnerability Data

A use of externally-controlled format string vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0 all versions allows an authenticated admin to execute unauthorized code or commands via specifically crafted configuration.

CWE(s)
CWE-134

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-48784Same product: Fortinet Fortios
CVE-2025-53843Same product: Fortinet Fortios
CVE-2024-35279Same product: Fortinet Fortios
CVE-2023-46714Same product: Fortinet Fortios
CVE-2023-44247Same product: Fortinet Fortios
CVE-2025-24477Same product: Fortinet Fortios
CVE-2025-58903Same product: Fortinet Fortios
CVE-2024-36504Same product: Fortinet Fortios
CVE-2024-46670Same product: Fortinet Fortios
CVE-2023-36639Same product: Fortinet Fortios

Affected Assets

fortinet
fortios
7.0.0 — 7.4.10 · 7.6.0 — 7.6.5

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and static analysis can discover format-string vulnerabilities before deployment.

SI-10 Information Input Validation good match

Input validation can reject or sanitize externally supplied format strings before they reach formatting functions.

SA-15 Development Process, Standards, and Tools partial match

Secure development standards and tools can mandate use of static format strings or safe formatting APIs.

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 prevent external format strings via code review, static analysis, and safe APIs.

ID.RA-01 partial match
prevents

Vulnerability identification can discover existing format-string flaws but does not prevent their introduction.

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.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development can detect format-string vulnerabilities before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates input validation and safe API usage that can prevent externally-controlled format strings.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify safe formatting functions and ban uncontrolled format strings.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles discourage dangerous string-handling patterns that lead to format-string issues.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly forbid the use of untrusted format strings and prescribe safe alternatives.

References