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The vulnerability CVE-2025-55717 is a cleartext storage issue (CWE-312) affecting Fortinet’s FortiMail, FortiRecorder, and FortiVoice products. It stems from the improper handling of sensitive data within debug logs. When a malicious administrator with authenticated access to the affected device executes specific Command Line Interface (CLI) commands, the system inadvertently logs user secrets, such as passwords or authentication tokens, in plaintext. These logs are stored on the device’s filesystem. The core weakness is that sensitive information is not encrypted or masked before being written to disk. An attacker with administrative privileges can then read these log files to extract the secrets of other users. Practical exploitation is limited as it requires the administrator to have already gained access to the targeted device. The vulnerability exists across multiple version ranges of the three product families. Remediation involves applying security updates provided by Fortinet to correct how logging mechanisms handle sensitive data.
Platform: Fortinet Products
Version: Multiple versions
Vulnerability: Cleartext Storage
Severity: Low
date: 2026-03-10
Prediction: 2026-04-30
What Undercode Say:
Analytics:
The vulnerability is present in multiple Fortinet product lines, indicating a systemic coding or design issue related to logging practices. Its low severity rating and requirement for authenticated administrative access mean it is not a vector for remote, unauthenticated attacks. However, it significantly elevates the risk of insider threats or post-compromise lateral movement, as an admin can leverage this flaw to harvest additional credentials. The attack vector is local, requiring shell access. The lack of public exploit availability suggests it is not yet actively targeted in the wild, but the disclosure of technical details makes reverse-engineering a proof-of-concept possible for skilled attackers.
bash commands and codes:
Example of how a malicious admin might discover the vulnerability
ssh admin@fortimail-device
Once logged in, check the configuration or run diagnostic commands
get system status
diagnose debug enable
The secrets might be exposed in the output of specific debug commands
diagnose debug config-logger all
After running commands, check the log files for plaintext secrets
cat /var/log/debug.log | grep -i “password\|secret\|token”
How Exploit:
Step 1: Attacker gains administrative access to the vulnerable Fortinet device via legitimate or compromised credentials.
Step 2: Attacker navigates to the CLI and executes a sequence of diagnostic or debugging commands.
Step 3: The system, due to the CWE-312 flaw, writes sensitive information (e.g., user credentials) in cleartext to a log file on the local filesystem while processing these commands.
Step 4: Attacker reads the log file using standard file viewing commands (e.g., cat, more, grep).
Step 5: Attacker extracts the plaintext secrets from the log output, which can then be used to compromise additional user accounts or systems.
Protection from this CVE:
Immediate action: Upgrade all affected FortiMail, FortiRecorder, and FortiVoice instances to the patched versions provided by Fortinet as specified in their security advisory. As a temporary workaround, restrict administrative access to the CLI to only trusted personnel and monitor admin activities. Implement strict logging and log integrity monitoring to detect unauthorized access to log files. Apply the principle of least privilege to all administrative accounts.
Impact:
An attacker with admin access can escalate their privileges laterally by obtaining secrets of other users, potentially including super-administrators or service accounts. This compromises the confidentiality of all user credentials stored or processed by the device. It can lead to a full system compromise, unauthorized access to email communications (FortiMail), video feeds (FortiRecorder), or voice data (FortiVoice). The integrity of the device is not directly impacted, but the availability of user data is effectively undermined through credential exposure.
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Sources:
Reported By: nvd.nist.gov
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