Vulnerability-Lookup

CVE-2026-8247 (GCVE-0-2026-8247)

Vulnerability from cvelistv5 – Published: 2026-07-02 23:07 – Updated: 2026-08-10 19:12

Title

WatchGuard Firebox admd Out of Bounds Write Vulnerability

Summary

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code. This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.

Severity

7.7 (High)


                        
                          CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-120

Assigner

WatchGuard

References

2 references

URL	Tags
https://psirt.watchguard.com/CVE-2026-8247	vendor-advisory
https://www.watchguard.com/wgrd-psirt/advisory/wg…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
WatchGuard	Fireware OS	Affected: 2025.1 , < 2026.2.1 (custom) Affected: 12.0 , < 12.12.1 (custom) Affected: 11.0 , < * (custom)
WatchGuard	Fireware OS	Affected: 12.0 , < 12.5.19 (custom)

Date Public

2026-07-02 23:07

Credits

Xander Mackenzie | @thetrueartist working with TrendAI Zero Day Initiative

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-8247

Vulnerability from fkie_nvd - Published: 2026-07-03 00:16 - Updated: 2026-07-07 05:16

Severity

7.7 (High) - CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	5d1c2695-1a31-4499-88ae-e847036fd7e3	https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00026

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Fireware OS",
          "vendor": "WatchGuard",
          "versions": [
            {
              "lessThanOrEqual": "11.12.4+541730",
              "status": "affected",
              "version": "11.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "12.12",
              "status": "affected",
              "version": "12.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "12.5.18",
              "status": "affected",
              "version": "12.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "2026.2",
              "status": "affected",
              "version": "2025.1",
              "versionType": "semver"
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    }
  ],
  "id": "CVE-2026-8247",
  "lastModified": "2026-07-07T05:16:55.517",
  "metrics": {
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          "attackRequirements": "PRESENT",
          "attackVector": "ADJACENT",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
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}

GHSA-H2W9-P676-66CH

Vulnerability from github – Published: 2026-07-03 00:31 – Updated: 2026-08-10 21:31

Details

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code.

This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.

Severity

7.7 (High)


                  
                    CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-8247"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-120"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-03T00:16:52Z",
    "severity": "HIGH"
  },
  "details": "An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code.\n\n\n\n\nThis vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.",
  "id": "GHSA-h2w9-p676-66ch",
  "modified": "2026-08-10T21:31:56Z",
  "published": "2026-07-03T00:31:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8247"
    },
    {
      "type": "WEB",
      "url": "https://psirt.watchguard.com/CVE-2026-8247"
    },
    {
      "type": "WEB",
      "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00026"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-8247 (GCVE-0-2026-8247)

FKIE_CVE-2026-8247

GHSA-H2W9-P676-66CH

Tags

Sightings

Nomenclature