4.9Medium
Watchguard Fireware
CVE-2026-13371
An authenticated administrator can trigger a denial-of-service condition in the Fireware Management Web UI by sending malformed or crafted data to the put_data endpoint, which performs unsafe deserialization of the attacker-supplied input.
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, with an administrator login, and without anyone at your company clicking anything.
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
- 4.9 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H- CVSS v4
- 6.9
- Weakness
- CWE-502
- Assigned by
- 5d1c2695-1a31-4499-88ae-e847036fd7e3
Dates
- Published
- 2026-07-03
- Last modified
- 2026-08-28
- Sources
- NVD
Affected products
- Watchguard Fireware2025.1 - 2026.2.1, 12.5 - 12.5.19, 12.0 - 12.12.1
- Watchguard Firebox M295all versions
- Watchguard Firebox M395all versions
- Watchguard Firebox M495all versions
- Watchguard Firebox M595all versions
- Watchguard Firebox M695all versions
- Watchguard Firebox T115-Wall versions
- Watchguard Firebox T125all versions
- Watchguard Firebox T125-Wall versions
- Watchguard Firebox T145all versions
- Watchguard Firebox T145-Wall versions
- Watchguard Firebox T185all versions
As listed in the NVD configuration data. Not a statement about your estate.