Denial of Service Vulnerability in Fireware Management Web UI by WatchGuard
CVE-2026-13371

6.9MEDIUM

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
2 July 2026

Badges

👾 Exploit Exists

What is CVE-2026-13371?

An authenticated administrator can exploit a flaw in the Fireware Management Web UI by sending specially crafted data to the put_data endpoint. This endpoint is susceptible to unsafe deserialization, which can lead to a denial-of-service condition, disrupting the application's availability. Proper input validation and sanitization measures should be implemented to mitigate this vulnerability.

Affected Version(s)

Fireware OS Default 2025.1 < 2026.2.1

Fireware OS Default 12.0 < 12.12.1

Fireware OS T15/T35 12.0 < 12.5.19

References

https://psirt.watchguard.com/CVE-2026-13371
vendor-advisory
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-...
vendor-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
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

Cody Sixteen
.