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CVE-2026-8247

WatchGuard Firebox admd Out of Bounds Write Vulnerability

CVSS score

7.7

EPSS probability

%0.4

Risk score

0.0

Published

3 mo ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-8247 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

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.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-8247 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1watchguardFireware OS View
2watchguardFireware OS View
3watchguardFireware OS View
4watchguardfireware View
5watchguardfireware View
6watchguardfireware View
7watchguardfirebox t15 View
8watchguardfirebox t35 View
9watchguardfireware View
10watchguardfirebox m295 View
11watchguardfirebox m395 View
12watchguardfirebox m495 View
13watchguardfirebox m595 View
14watchguardfirebox m695 View
15watchguardfirebox t115-w View
16watchguardfirebox t125 View
17watchguardfirebox t125-w View
18watchguardfirebox t145 View
19watchguardfirebox t145-w View
20watchguardfirebox t185 View
21watchguardfireware View
22watchguardfirebox cloud View
23watchguardfirebox m270 View
24watchguardfirebox m290 View
25watchguardfirebox m370 View
26watchguardfirebox m390 View
27watchguardfirebox m440 View
28watchguardfirebox m4600 View
29watchguardfirebox m470 View
30watchguardfirebox m4800 View
31watchguardfirebox m5600 View
32watchguardfirebox m570 View
33watchguardfirebox m5800 View
34watchguardfirebox m590 View
35watchguardfirebox m670 View
36watchguardfirebox m690 View
37watchguardfirebox nv5 View
38watchguardfirebox t20 View
39watchguardfirebox t25 View
40watchguardfirebox t40 View
41watchguardfirebox t45 View
42watchguardfirebox t55 View
43watchguardfirebox t70 View
44watchguardfirebox t80 View
45watchguardfirebox t85 View
46watchguardfireboxv View
Total affected vendors: 1|Products: 46

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
8.8CVSS V31HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HNVD
7.7CVSS V40HIGHCVSS: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:XNVD
7.7CVSS V4_0HIGHCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NCVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-8247 is associated with the following CWEs:

CWE-120: Common Weakness Enumeration Entry CWE-120CWE-787: Out-of-bounds Write

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-8247 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureBitişik ağ
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://psirt.watchguard.com/CVE-2026-8247vendor-advisoryhttps://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00026vendor-advisory

CVSS Vector Radar Chart

7.7 / 10
Attack VectorAdjacentComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

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
Attack VectorAdjacent network
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

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Weakness Type (CWE & CAPEC)

CWE-120 CWE-787

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