CVE-2026-78009: CWE-125 in WatchGuard Fireware OS
Description
CVE-2026-78009 is an out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process. It allows a remote unauthenticated attacker to cause a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic. The vulnerability affects specific versions of Fireware OS and has a high severity rating.
CVSS v4.0
Score 8.7high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-78009) involves an out-of-bounds read (CWE-125) in the iked process of WatchGuard Fireware OS. An attacker without authentication can exploit this flaw remotely by sending specially crafted network traffic to the VPN processing component, resulting in a Denial of Service condition. The vulnerability is identified with a CVSS v4.0 score of 8.7, indicating high severity. No known exploits are reported in the wild, and no patch or remediation details are provided in the available data.
Potential Impact
Successful exploitation causes a Denial of Service (DoS) in VPN processing, potentially disrupting VPN connectivity and network operations relying on the Fireware OS VPN service. There is no indication of privilege escalation, data disclosure, or code execution from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch links or official fixes are provided, users should monitor WatchGuard advisories for updates. Until a fix is available, consider limiting exposure of the VPN service to untrusted networks if feasible.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-j294-c4gm-rwh3
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-78009"]
- Database Specific Severity
- HIGH
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a91a7d2acd9273b4906577e
Added to database: 08/28/2026, 15:22:58 UTC
Last enriched: 09/08/2026, 06:07:47 UTC
Last updated: 10/13/2026, 06:48:19 UTC
Views: 46
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