Uncontrolled Resource Consumption Vulnerability in Fireware OS by WatchGuard
CVE-2026-86104

8.7HIGH

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
29 September 2026

Badges

👾 Exploit Exists

What is CVE-2026-86104?

An uncontrolled resource consumption vulnerability exists in the Fireware OS login process, specifically within the wgagent component. This flaw enables a remote, unauthenticated attacker to launch a denial of service attack by sending specially crafted requests. The exploitation of this vulnerability may result in significant service interruption, affecting users reliant on the affected systems. Organizations utilizing Fireware OS should assess their exposure and implement recommended security measures to mitigate potential impacts.

Affected Version(s)

Fireware OS Default 2026.3 < 2026.3.2

Fireware OS Default 2025.0 < 2026.2.3

Fireware OS Default 12.0 < 12.12.3

References

https://psirt.watchguard.com/CVE-2026-86104
vendor-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

WatchGuard AI Security Research
Laurent GAFFIE , secorizon.com
.