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

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 12.0 <= 12.12

Fireware OS 12.5 <= 12.5.18

Fireware OS 2025.1 <= 2026.2

References

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

  • Vulnerability published

  • Vulnerability Reserved

Credit

Cody Sixteen
.