# WatchGuard vulnerabilities & exploitation

> As of 2026-10-05, Threadlinqs tracks 7 WatchGuard CVEs, 0 in the CISA Known Exploited Vulnerabilities catalog, linked to 2 tracked threat campaigns.

**Data as of:** 2026-10-05

## Exploitation timeline

Threadlinqs has recorded 7 WatchGuard CVEs published between 2026-08-15 and 2026-09-15. The busiest month was 2026-09 (5 new CVEs). None of them is listed in CISA KEV yet.

## Most exploited vulnerabilities

Ranked with CISA KEV listings first, then EPSS exploit probability, then CVSS score. Showing 7 of 7 tracked WatchGuard CVEs.

- [CVE-2026-86134](https://intel.threadlinqs.com/cve/CVE-2026-86134) — HIGH 8.7 · EPSS 0.4% · 2026-09-30
- [CVE-2026-86104](https://intel.threadlinqs.com/cve/CVE-2026-86104) — HIGH 8.7 · EPSS 0.4% · 2026-09-29
- [CVE-2026-18145](https://intel.threadlinqs.com/cve/CVE-2026-18145) — HIGH 8.6 · EPSS 0.3% · 2026-09-29
- [CVE-2026-86131](https://intel.threadlinqs.com/cve/CVE-2026-86131) — CRITICAL 9.2 · EPSS 0.3% · 2026-09-29
- [CVE-2026-57909](https://intel.threadlinqs.com/cve/CVE-2026-57909) — CRITICAL 9.4 · EPSS 0.3% · 2026-08-25
- [CVE-2026-101891](https://intel.threadlinqs.com/cve/CVE-2026-101891) — CRITICAL 9.3 · EPSS 0.3% · 2026-09-28
- [CVE-2026-57910](https://intel.threadlinqs.com/cve/CVE-2026-57910) — CRITICAL 9.3 · EPSS 0.2% · 2026-08-25

## Products affected

Threadlinqs normalises CPE and CNA product records across all 7 CVEs; 3 distinct WatchGuard products are affected. The most frequently affected:

- Fireware OS — 4 CVEs
- Agent — 2 CVEs
- AP — 1 CVE

## Threat activity

2 tracked threat campaigns reference WatchGuard products or exploit WatchGuard CVEs:

- [WatchGuard Fireware OS Critical Code Injection Vulnerability in BOVPN over TLS Client (CVE-2026-86131)](https://intel.threadlinqs.com/threat/TL-2026-2813) — CRITICAL — 2026-09-30
- [Critical WatchGuard Agent for Windows Flaws (CVE-2026-57910, CVE-2026-57909) Enable Unauthenticated SYSTEM-Level RCE](https://intel.threadlinqs.com/threat/TL-2026-2162) — CRITICAL — 2026-08-27

## How to prioritise WatchGuard patching

This order follows the data Threadlinqs holds for WatchGuard, not a generic severity checklist:

- No WatchGuard CVE is in CISA KEV yet, so rank by exploit probability instead.
- Outside KEV, the highest EPSS scores are [CVE-2026-86134](https://intel.threadlinqs.com/cve/CVE-2026-86134) (0.4%), [CVE-2026-86104](https://intel.threadlinqs.com/cve/CVE-2026-86104) (0.4%), [CVE-2026-18145](https://intel.threadlinqs.com/cve/CVE-2026-18145) (0.3%).
- 4 CVEs score Critical and 3 High on CVSS v3 (maximum 9.4, average 9); sequence these after KEV and high-EPSS items.

## About this data

Vendor attribution comes from the CNA and CPE product records of each CVE, folded to one vendor name; CVSS, EPSS and KEV status are read from the Threadlinqs CVE catalog; campaign and actor links come from tracked threat records. Counts reflect the data as of 2026-10-05 and refresh daily.

Canonical: https://intel.threadlinqs.com/vendors/watchguard
All vendors: https://intel.threadlinqs.com/vendors
Full detection coverage and IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp