CVE-2026-86104: CWE-400 in WatchGuard Fireware OS
An uncontrolled resource consumption vulnerability in the Fireware OS login process (wgagent) allows a remote, unauthenticated attacker to cause a denial of service by sending a specially crafted request.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-86104) in WatchGuard Fireware OS is classified as CWE-400 (uncontrolled resource consumption). It specifically impacts the login process component (wgagent), enabling a remote attacker without authentication to trigger a denial of service condition by sending a specially crafted request. The CVSS 4.0 base score is 8.7, indicating high severity, with attack vector network, low attack complexity, no privileges or user interaction required, and high impact on availability. The vulnerability affects multiple version ranges of Fireware OS, as explicitly stated.
Potential Impact
An attacker can remotely cause a denial of service on the affected Fireware OS devices by exploiting this vulnerability, potentially disrupting network security functions dependent on the device. No evidence of exploitation in the wild is currently known.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, monitor for unusual login process behavior and consider applying any vendor-recommended temporary mitigations once published.
CVE-2026-86104: CWE-400 in WatchGuard Fireware OS
Description
An uncontrolled resource consumption vulnerability in the Fireware OS login process (wgagent) allows a remote, unauthenticated attacker to cause a denial of service by sending a specially crafted request.
CVSS v4.0
Score 8.7high
Affected software
WatchGuard
Fireware OS
WatchGuard
Fireware OS
pkg:github/watchguard/fireware-osRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-86104) in WatchGuard Fireware OS is classified as CWE-400 (uncontrolled resource consumption). It specifically impacts the login process component (wgagent), enabling a remote attacker without authentication to trigger a denial of service condition by sending a specially crafted request. The CVSS 4.0 base score is 8.7, indicating high severity, with attack vector network, low attack complexity, no privileges or user interaction required, and high impact on availability. The vulnerability affects multiple version ranges of Fireware OS, as explicitly stated.
Potential Impact
An attacker can remotely cause a denial of service on the affected Fireware OS devices by exploiting this vulnerability, potentially disrupting network security functions dependent on the device. No evidence of exploitation in the wild is currently known.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, monitor for unusual login process behavior and consider applying any vendor-recommended temporary mitigations once published.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WatchGuard
- Date Reserved
- 2026-09-05T00:11:52.119Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abc4826680226ef686df2c7
Added to database: 09/29/2026, 23:22:14 UTC
Last enriched: 09/29/2026, 23:36:38 UTC
Last updated: 09/30/2026, 03:38:29 UTC
Views: 8
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