Watchguard Fireware
CVE-2026-13084
A null pointer dereference vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker to create a denial-of-service (DoS) condition by sending specially crafted IKEv2 messages. This vulnerability affects both the Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when configured with a dynamic gateway peer. This vulnerability affects Fireware OS 11.10.2 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2
What this means for your business
- It affects Watchguard Fireware. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.5% chance of attack attempts being seen in the next 30 days, ranking above 41% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Watchguard Fireware, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- CVSS v4
- 8.7
- Weakness
- CWE-476
- Assigned by
- 5d1c2695-1a31-4499-88ae-e847036fd7e3
Dates
- Published
- 2026-07-03
- Last modified
- 2026-08-28
- Sources
- NVD
Affected products
- Watchguard Fireware12.5 - 12.5.19, 11.0.0 - 11.12.4, 11.12.4, 12.0 - 12.12.1, 2025.1 - 2026.2.1
- Watchguard Firebox T15all versions
- Watchguard Firebox T35all versions
- Watchguard Firebox Cloudall versions
- Watchguard Firebox M270all versions
- Watchguard Firebox M290all versions
- Watchguard Firebox M370all versions
- Watchguard Firebox M390all versions
- Watchguard Firebox M440all versions
- Watchguard Firebox M4600all versions
- Watchguard Firebox M470all versions
- Watchguard Firebox M4800all versions
As listed in the NVD configuration data. Not a statement about your estate.