CVE-2026-86131

A code injection vulnerability in WatchGuard Fireware OS's BOVPN Over TLS client configuration handling allows an attacker who controls the remote VPN server to execute arbitrary commands as root on the connecting Firebox.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://psirt.watchguard.com/CVE-2026-86131	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, 20:39

Type	Values Removed	Values Added
References	~~() https://psirt.watchguard.com/CVE-2026-86131 -~~	() https://psirt.watchguard.com/CVE-2026-86131 - Patch, Vendor Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8
CPE		cpe:2.3:o:watchguard:fireware::::::::
First Time		Watchguard Watchguard fireware

30 Sep 2026, 00:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-30 00:16

Updated : 2026-10-06 20:39

NVD link : CVE-2026-86131

Mitre link : CVE-2026-86131

CVE.ORG link : CVE-2026-86131

JSON object : View

Products Affected

watchguard

fireware

CWE

CWE-94

Improper Control of Generation of Code ('Code Injection')

CWE-295

Improper Certificate Validation

CWE-829

Inclusion of Functionality from Untrusted Control Sphere

{"id": "CVE-2026-86131", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-86131", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-01T03:55:39.882228Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.2, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/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": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "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": "2026-09-30T00:16:36.817", "references": [{"url": "https://psirt.watchguard.com/CVE-2026-86131", "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-94"}, {"lang": "en", "value": "CWE-295"}, {"lang": "en", "value": "CWE-829"}]}], "descriptions": [{"lang": "en", "value": "A code injection vulnerability in WatchGuard Fireware OS's BOVPN Over TLS client configuration handling allows an attacker who controls the remote VPN server to execute arbitrary commands as root on the connecting Firebox."}], "lastModified": "2026-10-06T20:39:54.950", "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"}