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Multiple Vulnerabilities in WatchGuard Fireware OS

WatchGuard Fireware OS is impacted by multiple high-severity vulnerabilities allowing remote attackers to achieve arbitrary code execution, privilege escalation, and denial-of-service.

CVE search metadata

CVE search record: CVE-2026-86134. EPSS: 0.42%. KEV: no. Product: Fireware OS. Brief: Multiple Vulnerabilities in WatchGuard Fireware OS. Brief link: https://feed.craftedsignal.io/briefs/2026-09-watchguard-fireware-vulnerabilities/

What's new

  • 1. added CVE-2026-86134 Oct 2, 02:12 via cccs

WatchGuard Fireware OS contains multiple security vulnerabilities that allow unauthenticated remote attackers to perform a variety of malicious actions. These include arbitrary code execution, which can be achieved with root-level privileges on affected network security appliances. Additional impacts include the bypass of established security controls, unauthorized access to or manipulation of sensitive configuration and traffic data, and the ability to trigger denial-of-service conditions that interrupt network availability. Defenders should prioritize auditing internet-facing appliances and ensuring firmware is updated to the latest vendor-supplied versions to mitigate these risks.

Impact

Successful exploitation of these vulnerabilities provides an attacker with complete control over the affected network appliance. This level of access enables the interception and inspection of internal network traffic, the exfiltration of sensitive configuration data, and the potential to move laterally into the internal network environment. The impact is critical for organizations relying on these devices as the primary perimeter defense, as these vulnerabilities jeopardize the integrity and confidentiality of the entire protected network.

Recommendation

Prioritize the identification of all internet-facing WatchGuard Fireware OS assets within your infrastructure. Apply the latest firmware patches provided by WatchGuard immediately. Monitor perimeter firewall logs for unusual management interface access or attempts to access administrative endpoints from external IP ranges.


Immediate actions

Inventory all WatchGuard Fireware OS appliances

IT Operations 24h

Apply firmware updates from WatchGuard for Fireware OS

IT Operations 48h

Mitigations

Restrict access to management interfaces to trusted internal networks only

immediate IT Operations

Remote exploitation vector