FortiExtender <=7.6.1 Buffer Overflow via CLI
CVE-2025-46776 Published on November 18, 2025
A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiExtender 7.6.0 through 7.6.1, FortiExtender 7.4.0 through 7.4.6, FortiExtender 7.2 all versions, FortiExtender 7.0 all versions may allow an authenticated user to execute arbitrary code or commands via crafted CLI commands.
Vulnerability Analysis
CVE-2025-46776 is exploitable with local system access, and requires user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Classic Buffer Overflow Vulnerability?
The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold, or when a program attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the "classic" case in which the program copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.
CVE-2025-46776 has been classified to as a Classic Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2025-46776
Want to know whenever a new CVE is published for Fortinet Fortiextender? stack.watch will email you.
Affected Versions
Fortinet FortiExtender:- Version 7.6.0, <= 7.6.1 is affected.
- Version 7.4.0, <= 7.4.6 is affected.
- Version 7.2.0, <= 7.2.5 is affected.
- Version 7.0.0, <= 7.0.5 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.