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CVE-2026-3987

WatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UI

CVSS score

8.6

EPSS probability

%1.1

Risk score

0.1

Published

6 mo ago

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

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-3987 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-3987 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

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

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
8.6CVSS V4_0HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NCVE CNA
8.6CVSS V40HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
7.2CVSS V31HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HNVD

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-2026-3987 is associated with the following CWEs:

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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-2026-3987 weaknesses.

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

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsHigh
UserGerekmiyor

Official Sources and Advisories

https://psirt.watchguard.com/CVE-2026-3987vendor-advisoryhttps://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00009vendor-advisory

CVSS Vector Radar Chart

8.6 / 10
Attack VectorNetworkComplexityLowPrivilegesHighUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh privileges
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.

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Weakness Type (CWE & CAPEC)

CWE-22

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