CVE-2026-86104

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://psirt.watchguard.com/CVE-2026-86104	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:watchguard:fireware::::::::
	cpe:2.3:o:watchguard:fireware::::::::
	cpe:2.3:o:watchguard:fireware::::::::
	cpe:2.3:o:watchguard:fireware::::::::

History

06 Oct 2026, 20:49

Type	Values Removed	Values Added
References	~~() https://psirt.watchguard.com/CVE-2026-86104 -~~	() https://psirt.watchguard.com/CVE-2026-86104 - Patch, Vendor Advisory
CPE		cpe:2.3:o:watchguard:fireware::::::::
First Time		Watchguard Watchguard fireware
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5

30 Sep 2026, 00:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-30 00:16

Updated : 2026-10-06 20:49

NVD link : CVE-2026-86104

Mitre link : CVE-2026-86104

CVE.ORG link : CVE-2026-86104

JSON object : View

Products Affected

watchguard

fireware

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-409

Improper Handling of Highly Compressed Data (Data Amplification)

CWE-770

Allocation of Resources Without Limits or Throttling

{"id": "CVE-2026-86104", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-86104", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-30T14:22:18.509930Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "affectedData": [{"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "2026.3", "lessThan": "2026.3.2", "versionType": "custom"}, {"status": "affected", "version": "2025.0", "lessThan": "2026.2.3", "versionType": "custom"}, {"status": "affected", "version": "12.0", "lessThan": "12.12.3", "versionType": "custom"}], "platforms": ["Default"], "defaultStatus": "unaffected"}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "lessThan": "12.5.21", "versionType": "custom"}], "platforms": ["T15/T35"], "defaultStatus": "unaffected"}]}], "published": "2026-09-30T00:16:36.420", "references": [{"url": "https://psirt.watchguard.com/CVE-2026-86104", "tags": ["Patch", "Vendor Advisory"], "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-409"}, {"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-10-06T20:49:44.270", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C618D05C-B8A0-4912-B87E-B67A0686C14D", "versionEndExcluding": "12.5.21", "versionStartIncluding": "12.0"}, {"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "684B81A6-0CE5-4424-A38A-FE989C790E7F", "versionEndExcluding": "12.12.3", "versionStartIncluding": "12.12"}, {"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9F11812A-FDA8-401D-871B-219DFDADEDC8", "versionEndExcluding": "2026.2.3", "versionStartIncluding": "2025.0"}, {"criteria": "cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "525833A2-ABEC-4C06-BE1B-6A5E64A21775", "versionEndExcluding": "2026.3.2", "versionStartIncluding": "2026.3"}], "operator": "OR"}]}], "sourceIdentifier": "5d1c2695-1a31-4499-88ae-e847036fd7e3"}