External risk intelligence

Fortinet FortiAnalyzer and FortiManager Stack Buffer Overflow Vulnerability Executes Unauthorized Code

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2024-35276

FortiManager and FortiAnalyzer are network management and logging appliances. While they are often restricted to internal management networks, they are frequently deployed as central gateways or edge-adjacent controllers to manage distributed security infrastructure, making them common targets for remote accessibility in enterprise network architectures.

Out-of-bounds Write

Fortinet Fortianalyzer

6.4.0 to before 6.4.157.0.0 to before 7.0.137.2.0 to before 7.2.67.4.0 to before 7.4.46.4.1 to before 7.0.127.2.1 to before 7.2.67.4.1 to before 7.4.4

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in Fortinet's FortiAnalyzer and FortiManager products, which are used for network security management and analysis. This issue allows for unauthorized code execution by attackers through specially crafted network packets. The main concern is confirming the relevance and exposure of these specific systems within our environment.

Flaw in network management tools enables code execution.
Critical issue impacts network visibility and control.
Confirm relevance and potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted packets over the network to vulnerable FortiAnalyzer or FortiManager devices. This could allow them to execute unauthorized code or commands on the affected system, potentially leading to further compromise.

Network access required.
Specially crafted packets trigger overflow.
Unauthorized code execution possible.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to execute arbitrary code or commands on affected Fortinet devices by sending specially crafted network packets. This could lead to a compromise of the device's integrity and potentially allow for further network intrusion.

System data and service behavior at risk.
Exploitable via specially crafted network packets.
Allows unauthorized code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts Fortinet FortiAnalyzer and FortiManager products, including their cloud versions. Ownership likely lies with the infrastructure or platform teams managing these Fortinet appliances, potentially involving vendor management if direct vendor engagement is needed. The first practical step is to identify all deployed instances, assess their network exposure and criticality, confirm the accountable owner for each, and then develop a prioritized remediation plan.

Identify and confirm vulnerable appliance ownership.
Verify network exposure and business criticality.
Plan remediation or temporary risk reduction.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is FortiAnalyzer and FortiManager?

These are centralized platforms from Fortinet designed to manage network security infrastructure. FortiManager provides unified control over security policies and devices, while FortiAnalyzer aggregates and analyzes logs from across the network. Organizations rely on them to gain visibility into traffic, maintain compliance, and streamline the administration of distributed security appliances.

What is the vulnerability in CVE-2024-35276?

This CVE describes a stack-based buffer overflow, categorized as CWE-121 and CWE-787. In plain terms, the software fails to properly check the size of incoming data before processing it. By sending a specially crafted packet, an attacker can overflow the memory space allocated for that task, allowing them to overwrite adjacent data and potentially run unauthorized code or commands on the system.

How can an attacker trigger this vulnerability?

An attacker triggers this by sending malformed or specially crafted packets to the affected device over the network. It is important to note that this is not triggered by typical, valid network traffic or routine logging operations. The flaw requires specifically structured data that exploits the way the device handles memory buffers to bypass security controls.

Is my device at risk based on Halo Surface Signal?

Halo Surface Signal identifies these appliances as network management tools that, while often kept on internal networks, are frequently deployed as gateways or edge-adjacent controllers. Because they are often positioned to manage distributed infrastructure, they may be accessible from broader network segments, increasing the need to verify if your specific instances are reachable.

How do I respond to this threat?

Start by identifying all instances of FortiAnalyzer and FortiManager in your environment, including cloud-hosted versions. Once mapped, confirm which versions you are running against the affected list. Prioritize these assets based on their network accessibility and function, then coordinate with your infrastructure or platform teams to plan and apply the necessary updates or patches provided by the vendor.

References

fortiguard.fortinet.com/psirt/FG-IR-24-165

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.