BugZero | F5 BugID 1399517 - FrameElement Wrappers occasionaly returns 'Undefin...

F5 - Defect ID: 1399517

FrameElement Wrappers occasionaly returns 'Undefined' instead of original Window object failing to load frame/iframes

F5 - Defect ID: 1399517

FrameElement Wrappers occasionaly returns 'Undefined' instead of original Window object failing to load frame/iframes

Last updated on July 18th, 2026

BugZero Risk Score
6.7 Medium

Overall: 6.7

Severity: 7.3

Community: 4.2

Lifecycle: 6.4

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Bug Details

Priority: 3-Major
Status: New
Impact Category: Access Policy Manager

Description

Symptoms

Iframes are not loading properly

Impact

Application fail to load iframes

Conditions

Modern Rewriting/Mode is used

Workaround

Use the below iRule: when CLIENT_ACCEPTED { ACCESS::restrict_irule_events disable } when HTTP_REQUEST { if { [HTTP::path] ends_with "cache-fm-Modern.js" } { HTTP::respond 200 content [ifile get ModernCachefm] } } iFile - Request the ifile with fix via Escalation

Fix Information

None

Change history

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions:16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 16.1.6.1

Fixed versions: No known fixed versions

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: No known fixed versions

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F5 - Defect ID: 1399517

FrameElement Wrappers occasionaly returns 'Undefined' instead of original Window object failing to load frame/iframes

F5 - Defect ID: 1399517

FrameElement Wrappers occasionaly returns 'Undefined' instead of original Window object failing to load frame/iframes

Last updated on July 18th, 2026

BugZero Risk Score6.7 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

F5 - Defect ID: 1399517

FrameElement Wrappers occasionaly returns 'Undefined' instead of original Window object failing to load frame/iframes

F5 - Defect ID: 1399517

FrameElement Wrappers occasionaly returns 'Undefined' instead of original Window object failing to load frame/iframes

Last updated on July 18th, 2026

BugZero Risk Score6.7 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
6.7 Medium

BugZero Risk Score
6.7 Medium