BugZero | F5 BugID 1785385 - Intermittent traffic failures when tenant is runni...

F5 - Defect ID: 1785385

Intermittent traffic failures when tenant is running BIG-IP v17.1.2 or above and host is on version prior to F5OS-A 1.8.0 or F5OS-C 1.8.0

F5 - Defect ID: 1785385

Intermittent traffic failures when tenant is running BIG-IP v17.1.2 or above and host is on version prior to F5OS-A 1.8.0 or F5OS-C 1.8.0

Last updated on May 9th, 2026

BugZero Risk Score
9.4 High

Overall: 9.4

Severity: 10.0

Community: 4.2

Lifecycle: 8.7

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Bug Details

Priority: 1-Blocking
Status: Resolved
Impact Category: Local Traffic Manager

Description

Symptoms

Intermittent traffic failures for a tenant running BIG-IP v17.1.2 or above. This often manifests as ICMP monitors failing.

Impact

Intermittent traffic disruption. This often manifests as ICMP monitors intermittently failing, but will also impact virtual server traffic and other protocols (e.g. UDP and TCP).

Conditions

- Tenant running BIG-IP v17.1.2 or above - Host is one of the following platforms: -- r5000, r10000, or r12000-series appliance -- VELOS - Host is running a version prior to F5OS-A 1.8.0 (rSeries appliance) or F5OS-C 1.8.0 (VELOS chassis)

Workaround

Upgrade F5OS to version 1.8.0 or higher.

Fix Information

New FPGA bitstreams in F5OS-A 1.8.0 and F5OS-C 1.8.0 resolve this issue.

Change history

2026-05-09 Added: 17.1.3, 17.1.3.1, 17.1.3.2, 17.5.1.2, 17.5.1.3, 21.0.0, 21.0.0.1

2026-05-05 Added: 17.1.3, 17.1.3.1, 17.1.3.2, 17.5.1.2, 17.5.1.3, 21.0.0, 21.0.0.1

2026-02-25 Added: 17.1.3, 17.1.3.1, 17.5.1.2, 17.5.1.3, 21.0.0, 21.0.0.1

2025-12-11 Added: 17.1.3, 17.5.1.2, 17.5.1.3, 21.0.0

2025-12-10 Added: 17.1.3, 17.5.1.2, 17.5.1.3, 21.0.0

2025-12-06 Added: 17.1.3, 17.5.1.2, 17.5.1.3, 21.0.0

2025-11-08 Added: 17.1.3, 17.5.1.2, 17.5.1.3, 21.0.0

2025-10-30 Added: 17.1.3, 17.5.1.2, 17.5.1.3

2025-10-29 Added: 17.1.3, 17.5.1.2, 17.5.1.3

2025-10-25 Added: 17.1.3, 17.5.1.2, 17.5.1.3

2025-10-24 Added: 17.1.3, 17.5.1.2, 17.5.1.3

2025-10-23 Added: 17.1.3, 17.5.1.2, 17.5.1.3

2025-10-15 Added: 17.1.3, 17.5.1.2, 17.5.1.3

2025-10-07 Added: 17.5.1.2

2025-09-25 Added: 17.1.2, 17.1.2.1, 17.1.2.2, 17.5.0, 17.5.1

Relevant Products

Click on a version to see all relevant bugs

Affected versions:17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3, 17.1.3.1, 17.1.3.2, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 21.0.0, 21.0.0.1

Fixed versions: 17.5.1.4

Relevant Products

Click on a version to see all relevant bugs

Affected versions:17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3, 17.1.3.1, 17.1.3.2, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 21.0.0, 21.0.0.1

Fixed versions: 17.5.1.4

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F5 - Defect ID: 1785385

Intermittent traffic failures when tenant is running BIG-IP v17.1.2 or above and host is on version prior to F5OS-A 1.8.0 or F5OS-C 1.8.0

F5 - Defect ID: 1785385

Intermittent traffic failures when tenant is running BIG-IP v17.1.2 or above and host is on version prior to F5OS-A 1.8.0 or F5OS-C 1.8.0

Last updated on May 9th, 2026

BugZero Risk Score9.4 High

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Top F5 Defects

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BugZero Risk Score
9.4 High