CVE-2026-19316 | BDVDB-2026-365331 Detail

WatchGuardFireware OS

Description#

A double-free vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.

Impact#

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

Weaknesses#

CWE-415 Double Free
CWE-416 Use After Free

References#

https://psirt.watchguard.com/CVE-2026-19316

Exploit#

No public exploit known

History#

Version 12026-08-27Record published in the CVE List.
Version 22026-09-03Most recent update recorded in the CVE List.

Published

Published: 2026-08-27
Last modified: 2026-09-03

Vendor information

Vendor: WatchGuard
Product: Fireware OS

All WatchGuard vulnerabilities

Score

8.7 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 46.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

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

Affected Systems

Vulnerable
>= 2025.0 and < 2026.2.2
Fixed
2026.2.2
Vulnerable
>= 12.0 and < 12.12.2
Fixed
12.12.2
Vulnerable
>= 2026.3 and < 2026.3.1
Fixed
2026.3.1
Vulnerable
>= 12.0 and < 12.5.20
Fixed
12.5.20

Scoring System

CVSS v4.0

8.7 High

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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	None
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).