BugZero | Fortinet BugID 1263949 - An error condition in IPS Engine occurs when switc...

BugZero | Fortinet BugID 1263949 - An error condition in IPS Engine occurs when switc...

Fortinet - Defect ID: 1263949

An error condition in IPS Engine occurs when switching packet layer modes

Fortinet - Defect ID: 1263949

An error condition in IPS Engine occurs when switching packet layer modes

Last updated on May 7th, 2026

BugZero Risk Score
8.0 High

Overall: 8.0

Lifecycle: 10.0

Community: 3.7

What is the BugZero Risk Score?

Fortinet Integration

Learn more about where this data comes from

Fortinet Integration

Bug Scrub Advisor

Streamline upgrades with automated vendor bug scrubs

Bug Scrub Advisor

BugZero Enterprise

Wish you caught this bug sooner? Get proactive today.

BugZero Enterprise

Bug Details

Priority: Unspecified
Status: Fixed
Impacted Service: Intrusion Prevention

Description

An error condition in IPS Engine occurs when switching packet layer modes

Change history

2026-05-07 Added: 7.4.12

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions:No known affected versions

Fixed versions: 7.4.12

Relevant Products

Click on a version to see all relevant bugs

Affected versions:No known affected versions

Fixed versions: 7.4.12

Top Fortinet Defects

8.0Defect ID: 1211374
High memory usage occurs when HTTP2 is enabled on the firewall VIP and the real server only supports HTTP1.1
8.0Defect ID: 1254074
Duplicate Reassociation Responses were sent to same Wi-Fi client roaming between two FortiAP units
8.0Defect ID: 1260751
Boot failure occurs when upgrading FortiGate on KVM from 7.2.12 to 7.4.11
8.0Defect ID: 1263949
An error condition in IPS Engine occurs when switching packet layer modes
8.0Defect ID: 1116920
An error condition in IPS engine occurs when upgrading from 7.0.8 to 7.4.6

Ready to prevent the next vendor outage?