BugZero | F5 BugID 1635209 - Firewall NAT policy with SNAT automap does not wor...

F5 - Defect ID: 1635209

Firewall NAT policy with SNAT automap does not work with ALG protocols in active mode

F5 - Defect ID: 1635209

Firewall NAT policy with SNAT automap does not work with ALG protocols in active mode

Last updated on November 5th, 2025

BugZero Risk Score
6.9 Medium

Overall: 6.9

Severity: 7.3

Community: 4.2

Lifecycle: 8.3

What is the BugZero Risk Score?

F5 Integration

Learn more about where this data comes from

F5 Integration

Learn more

BugZero Plan

Streamline upgrades with automated vendor bug scrubs

BugZero Plan

Learn more

BugZero Prevent

Wish you caught this bug sooner? Get proactive today.

BugZero Prevent

Learn more

Bug Details

Priority: 3-Major
Status: Verified
Impact Category: Advanced Firewall Manager

Description

Symptoms

Connection is dropping when firewall NAT policy uses SNAT automap and ALG.

Impact

-- Connection is dropped

Conditions

-- Firewall NAT translation using source automap. -- ALG protocol profile applied.

Workaround

None

Fix Information

Done

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, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.5.0, 17.5.1

Fixed versions: 21.0.0, 17.5.1.2, 17.1.3

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: 21.0.0, 17.5.1.2, 17.1.3

Top F5 Defects

9.6Defect ID: 546260
TMM can crash if using the v6rd profile
9.6Defect ID: 934133
Unable to Create/delete ltm virtual server via CLI transaction when destination is not specified on the ltm virtual object
9.6Defect ID: 1154417
Profile based attack is not mitigated at hardware on L2 wire setup
9.6Defect ID: 913713
Rebooting a blade causes MCPd to core as it rejoins the cluster
9.6Defect ID: 2141125
Multicast traffic is dropped with incorrect VLAN tagging

F5 Integration

Learn more about where this data comes from

F5 Integration

Learn more

BugZero Plan

Streamline upgrades with automated vendor bug scrubs

BugZero Plan

Learn more

BugZero Prevent

Wish you caught this bug sooner? Get proactive today.

BugZero Prevent

Learn more

Ready to prevent the next vendor outage?

Get a demo

F5 - Defect ID: 1635209

Firewall NAT policy with SNAT automap does not work with ALG protocols in active mode

F5 - Defect ID: 1635209

Firewall NAT policy with SNAT automap does not work with ALG protocols in active mode

Last updated on November 5th, 2025

BugZero Risk Score6.9 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

F5 - Defect ID: 1635209

Firewall NAT policy with SNAT automap does not work with ALG protocols in active mode

F5 - Defect ID: 1635209

Firewall NAT policy with SNAT automap does not work with ALG protocols in active mode

Last updated on November 5th, 2025

BugZero Risk Score6.9 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
6.9 Medium

BugZero Risk Score
6.9 Medium