CVE-2026-78009 - Vulnerability Details - OpenCVE

An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Vendors	Products
Watchguard Subscribe	Fireware Os Subscribe

No data.

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

Fireware OS 2026.2.2, Fireware OS 12.12.2, Fireware OS 12.5.20

Workaround

No workaround given by the vendor.

References

Link	Providers
https://psirt.watchguard.com/CVE-2026-78009

History

Thu, 27 Aug 2026 18:00:00 +0000

Type	Values Removed	Values Added
Description		An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.
Title		Fireware OS Out-of-Bounds Read in iked Allows Unauthenticated Denial of Service (DoS)
First Time appeared		Watchguard Watchguard fireware Os
Weaknesses		CWE-125 CWE-20
CPEs		cpe:2.3:a:watchguard:fireware_os::::::::
Vendors & Products		Watchguard Watchguard fireware Os
References		https://psirt.watchguard.com/CVE-2026-78009
Metrics		cvssV4_0 `{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}`

Projects

Sign in to view the affected projects.

MITRE

Status: PUBLISHED

Assigner: WatchGuard

Published: 2026-08-27T23:24:32.671Z

Updated: 2026-08-27T23:24:32.671Z

Reserved: 2026-08-21T21:46:42.399Z

Link: CVE-2026-78009

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-08-28T02:16:22.293

Modified: 2026-08-28T02:16:22.293

Link: CVE-2026-78009

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-78009", "assignerOrgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "state": "PUBLISHED", "assignerShortName": "WatchGuard", "dateReserved": "2026-08-21T21:46:42.399Z", "datePublished": "2026-08-27T23:24:32.671Z", "dateUpdated": "2026-08-27T23:24:32.671Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "shortName": "WatchGuard", "dateUpdated": "2026-08-27T23:24:32.671Z"}, "title": "Fireware OS Out-of-Bounds Read in iked Allows Unauthenticated Denial of Service (DoS)", "descriptions": [{"lang": "en", "value": "An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic."}], "affected": [{"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "2025.0", "versionType": "custom", "lessThan": "2026.2.2"}, {"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.12.2"}], "defaultStatus": "unaffected", "platforms": ["Default"]}, {"vendor": "WatchGuard", "product": "Fireware OS", "versions": [{"status": "affected", "version": "12.0", "versionType": "custom", "lessThan": "12.5.20"}], "defaultStatus": "unaffected", "platforms": ["T15/T35"]}], "references": [{"url": "https://psirt.watchguard.com/CVE-2026-78009", "tags": ["vendor-advisory"]}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.5.20"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "2025.0", "versionEndExcluding": "2026.2.2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.0", "versionEndExcluding": "12.12.2"}]}]}], "metrics": [{"cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "baseScore": 8.7, "baseSeverity": "HIGH"}}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-125", "type": "CWE", "cweId": "CWE-125"}, {"lang": "en", "description": "CWE-20", "type": "CWE", "cweId": "CWE-20"}]}], "credits": [{"lang": "en", "value": "Discovered Internally by WatchGuard AI Security Research", "type": "finder"}], "configurations": [{"lang": "en", "value": "This vulnerability is exploitable on systems where the Mobile VPN with IKEv2 or a Branch Office VPN with IKEv2 is configured.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>This vulnerability is exploitable on systems where the Mobile VPN with IKEv2 or a Branch Office VPN with IKEv2 is configured.</p>"}]}], "solutions": [{"lang": "en", "value": "Fireware OS 2026.2.2, Fireware OS 12.12.2, Fireware OS 12.5.20", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Fireware OS 2026.2.2, Fireware OS 12.12.2, Fireware OS 12.5.20"}]}], "exploits": [{"lang": "en", "value": "WatchGuard is not aware of any exploitation of this vulnerability in the wild.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>WatchGuard is not aware of any exploitation of this vulnerability in the wild.</p>"}]}]}}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["Default"], "product": "Fireware OS", "vendor": "WatchGuard", "versions": [{"lessThan": "2026.2.2", "status": "affected", "version": "2025.0", "versionType": "custom"}, {"lessThan": "12.12.2", "status": "affected", "version": "12.0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "platforms": ["T15/T35"], "product": "Fireware OS", "vendor": "WatchGuard", "versions": [{"lessThan": "12.5.20", "status": "affected", "version": "12.0", "versionType": "custom"}]}], "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An out-of-bounds read vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic."}], "id": "CVE-2026-78009", "lastModified": "2026-08-28T02:16:22.293", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "type": "Secondary"}]}, "published": "2026-08-28T02:16:22.293", "references": [{"source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "url": "https://psirt.watchguard.com/CVE-2026-78009"}], "sourceIdentifier": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-125"}], "source": "5d1c2695-1a31-4499-88ae-e847036fd7e3", "type": "Secondary"}]}