An improper check or handling of exceptional conditions vulnerability [CWE-703] exists in multiple Fortinet products, including FortiOS versions 7.4.0 through 7.4.3 and prior to 7.2.7, FortiProxy versions 7.4.0 through 7.4.3 and prior to 7.2.9, FortiPAM before 1.2.0, and FortiSwitchManager versions 7.2.0 through 7.2.3 and 7.0.0 through 7.0.3. This vulnerability allows an unauthenticated attacker to repeatedly reset the fgfm connection via crafted SSL encrypted TCP requests.
The vulnerability has been assigned a CVSS score of 5.3, classifying it as medium severity. The risk to organizations includes potential downtime or disruption of services due to repeated connection resets, which could affect availability.
Currently, there are no known exploits available, and the CVE is not included in the Known Exploited Vulnerabilities (KEV) catalog. However, organizations should remain vigilant as threat actors may look to exploit such vulnerabilities.
Organizations should prioritize patching immediately to mitigate this vulnerability and protect their network infrastructure.
Vulnerability Details
The vulnerability is characterized by an improper check or handling of exceptional conditions, categorized under CWE-703. The affected versions include:
1. FortiOS: 7.4.0 - 7.4.3, before 7.2.7 2. FortiProxy: 7.4.0 - 7.4.3, before 7.2.9 3. FortiPAM: before 1.2.0 4. FortiSwitchManager: 7.2.0 - 7.2.3, 7.0.0 - 7.0.3
The vulnerability was published on October 14, 2025, and its current status is analyzed.
Technical Analysis
The root cause of this vulnerability lies in improper handling of exceptional conditions, which may lead to a state where an attacker can manipulate the fgfm connection. The attack vector is categorized as network-based, requiring no privileges or user interaction, making it easily exploitable.
The attack complexity is low, as attackers can exploit this vulnerability without needing elevated privileges. Additionally, the impact on availability is considered low, as the primary effect is the repeated resetting of connections.
Risk & Impact Analysis
With the vulnerability affecting multiple products, the real-world risk includes potential service disruptions for organizations utilizing Fortinet technologies. The potential blast radius could impact any connected systems relying on these products.
Given the CVSS score of 5.3 and the absence of known exploits, organizations should address this vulnerability in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions are affected by the vulnerability:
1. FortiOS: All versions from 6.2.0 to 7.2.7 and 7.4.0 to 7.4.3 2. FortiProxy: All versions from 1.2.0 to 7.2.9 and 7.4.0 to 7.4.3 3. FortiPAM: All versions before 1.2.0 4. FortiSwitchManager: All versions from 7.0.0 to 7.0.3 and 7.2.0 to 7.2.3
Mitigation & Remediation
Fortinet has released patches for the affected products. Organizations should upgrade to the following versions to remediate the vulnerability:
1. FortiOS: Upgrade to version 7.4.4 or later. 2. FortiProxy: Upgrade to version 7.4.4 or later. 3. FortiPAM: Upgrade to version 1.2.0 or later. 4. FortiSwitchManager: Upgrade to version 7.0.4 or later.
If immediate patching is not feasible, implementing network controls to limit external access can help mitigate the risk.
Organizations should also monitor logs for any unusual activity related to fgfm connections.
Detection Guidance
Detection of potential exploitation attempts may involve monitoring network traffic for repeated fgfm connection resets or unusual patterns of SSL traffic.
Log indicators should include timestamps, source and destination IP addresses, and SSL handshake failures.
AppSecure Threat Intelligence Insight
The vulnerability highlights common weaknesses in handling exceptional conditions across network devices. It emphasizes the need for robust input validation and error handling to thwart potential exploits.
Security teams should adopt a proactive approach by routinely assessing their configurations and updating them based on emerging threats.
For further insights on managing vulnerabilities, organizations can explore resources on vulnerability management programs and penetration testing methodologies to enhance their security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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