WatchGuard Firebox T35 end of life
Firebox T Series · also known as T35, Firebox T35-W, T35-W
Status
Checked 30 Sep 2026Firebox T35 no longer receives security fixes. If it's still running your office firewall, plan a replacement now.
- 1End of sale 17 Jul 2021 (5 years ago)
- 2Last date of support 31 Dec 2025 (9 months ago)
Key dates
Every date links to WatchGuard's own page| Milestone | Date | Source |
|---|---|---|
| End of sale | 17 Jul 20215 years ago | Vendor bulletin ↗ |
| End of software maintenance | Not announced | – |
| End of vulnerability support | Not announced | – |
| Last date of support | 31 Dec 20259 months ago | Vendor bulletin ↗ |
WatchGuard lists only End of Sale and End of Life. End of Life is recorded here as last date of support; WatchGuard does not publish separate software maintenance or vulnerability support dates on this page.
What this means for your business
- No new security patches: newly found vulnerabilities stay open on an internet-facing device.
- Cyber insurance questionnaires increasingly ask whether any equipment is unsupported or past end of life.
- No vendor support for faults, so a failure can mean days without a working firewall.
- This is general information, not legal or insurance advice.
Replacement options
Vendor-neutral options to consider:
- Fortinet FortiGate (entry range)
- Ubiquiti UniFi Cloud Gateway
- MikroTik RouterOS appliances
The right replacement depends on your sites, users and licensing, and is often cheaper than a like-for-like swap.
Keep or replace? Quick checklist
- Is it your internet-facing firewall?
- Do you have remote staff connecting through it?
- Is your cyber insurance renewal in the next 6 months?
- Do you store client or financial data behind it?
- Is it running old firmware, or does it have no active vendor licence?
Two or more “yes” answers on an unsupported or soon-to-be-unsupported device is a good reason to get advice.
Frequently asked questions
Is the Firebox T35 still safe to use?
Not for a business network. WatchGuard no longer issues security fixes for the Firebox T35, so new vulnerabilities will not be patched.
What replaced the Firebox T35?
WatchGuard's bulletin does not name a direct replacement that we've verified. The right choice depends on your sites, users and licensing.
Where do these dates come from?
From WatchGuard's own lifecycle bulletins. Each date in the table links to its source, with the date we last checked it. Always confirm with WatchGuard before making decisions.