CVE-2016-7541: Fortinet FortiOS vulnerability

CVE-2016-7541: Long lived sessions in Fortinet FortiGate devices with FortiOS 5.x before 5.4.0 could violate a security po...

Long lived sessions in Fortinet FortiGate devices with FortiOS 5.x before 5.4.0 could violate a security policy during IPS signature updates when the FortiGate's IPSengine is configured in flow mode. All FortiGate versions with IPS configured in proxy mode (the default mode) are not affected.

UnknownCVSS not scoredNot KEV-listedUpdatedOct 25, 2024, 14:35 UTC (UTC+00:00)

Security readout for executives and security teams

This issue affects Fortinet FortiGate firewalls running FortiOS 5.0.x or 5.2.x. Under a specific IPS configuration, long-running network sessions could continue in a way that violates security policy during IPS signature updates. Default IPS proxy mode is reported as not affected. Exposure is limited to FortiGate devices on FortiOS 5.0.x or 5.2.x using IPSengine flow mode. FortiGate deployments using IPS proxy mode, described as the default, are not affected per the source description. Treat as a targeted legacy firewall remediation item, not an internet-wide emergency. Prioritize if FortiGate appliances still enforce critical network controls on FortiOS 5.0.x or 5.2.x with IPS flow mode enabled. Mitigation focus: Identify FortiGate devices still running FortiOS 5.0.x or 5.2.x.; Upgrade affected FortiOS deployments to 5.4.0 or later where vendor guidance supports it.; Confirm IPS is using proxy mode if upgrade cannot happen immediately..

Prepared: Jun 13, 2026, 05:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Mar 30, 2017, 14:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

1Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

FortinetFortiOS5.0.x, 5.2.xListed

Weakness

CWE details

No CWE listed

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