6.1Medium
Watchguard Fireware
CVE-2025-13937
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS (ConnectWise Technology Integration module) allows Stored XSS.
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, but only after tricking someone into an action such as opening a file or a link.
- FIRST's prediction model gives it a 0.2% chance of attack attempts being seen in the next 30 days, ranking above 8% 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
- 6.1 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- CVSS v4
- 4.8
- Weakness
- CWE-79
- Assigned by
- 5d1c2695-1a31-4499-88ae-e847036fd7e3
Dates
- Published
- 2025-12-04
- Last modified
- 2026-09-25
- Sources
- NVD
Affected products
- Watchguard Fireware2025.1 - 2025.1.3, 12.0.0 - 12.11.5, 12.5 - 12.5.14
- 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
- Watchguard Firebox M270all versions
- Watchguard Firebox M290all versions
- Watchguard Firebox M370all versions
- Watchguard Firebox M390all versions
- Watchguard Firebox M440all versions
As listed in the NVD configuration data. Not a statement about your estate.