CVE-2026-19314: CWE-191 in WatchGuard Fireware OS
Description
An integer underflow 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.
CVSS v4.0
Score 8.7high
Affected software
WatchGuard
Fireware OS
WatchGuard
Fireware OS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-19314) involves an integer underflow (CWE-191) in the iked process of WatchGuard Fireware OS. An attacker who is remote and unauthenticated can exploit this flaw by sending specially crafted network traffic to trigger a Denial of Service condition affecting VPN processing. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity. The affected versions explicitly include =12.0, =2025.0, and =2026.3. No vendor advisory or patch information is currently available, and no known exploits have been reported in the wild.
Potential Impact
Successful exploitation results in a Denial of Service (DoS) condition in VPN processing on affected WatchGuard Fireware OS devices. This can disrupt VPN connectivity and potentially impact network availability for users relying on the VPN service. There is no indication of privilege escalation or data compromise from the available information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, monitor for vendor updates and consider limiting exposure of the iked process to untrusted networks if feasible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WatchGuard
- Date Reserved
- 2026-08-07T20:05:53.603Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a90ed89acd9273b49475498
Added to database: 08/28/2026, 02:08:09 UTC
Last enriched: 09/07/2026, 12:52:05 UTC
Last updated: 10/10/2026, 18:48:17 UTC
Views: 79
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