CVE-2026-13371 | BDVDB-2026-345155 Detail

WatchGuardFireware OS

Description#

An authenticated administrator can trigger a denial-of-service condition in the Fireware Management Web UI by sending malformed or crafted data to the put_data endpoint, which performs unsafe deserialization of the attacker-supplied input.

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

CWE-502 Deserialization of Untrusted Data

References#

Exploit#

No public exploit known

History#

Version 12026-07-02Record published in the CVE List.
Version 22026-08-27Most recent update recorded in the CVE List.

Published

Published: 2026-07-02
Last modified: 2026-08-27

Vendor information

Vendor: WatchGuard
Product: Fireware OS

All WatchGuard vulnerabilities

Score

6.9 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 48.5.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Insecure Deserialization

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 2025.1 and < 2026.2.1
Fixed
2026.2.1
Vulnerable
>= 12.0 and < 12.12.1
Fixed
12.12.1
Vulnerable
>= 12.0 and < 12.11.9
Fixed
12.11.9
Vulnerable
>= 12.0 and < 12.5.19
Fixed
12.5.19

Scoring System

CVSS v4.0

6.9 Medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	High
User Interaction	None
Vulnerable System Confidentiality	None
Vulnerable System Integrity	None
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).