Fireware OS Link Following in firewalld Allows Local Arbitrary File Overwrite as Root

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93864
StatePUBLISHED
AssignerWatchGuard
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-27 16:17:32 UTC
Updated2026-10-28 14:39:26 UTC
DescriptionA link following vulnerability in WatchGuard Fireware OS’s firewall daemon allows a local attacker with code execution as a low-privileged system process to overwrite arbitrary files with root privileges, and to tamper with firewall IP set data, by planting a crafted file system object and triggering a list update. Written content is partially constrained.

Risk And Classification

Primary CVSS: v4.0 7.1 HIGH from 5d1c2695-1a31-4499-88ae-e847036fd7e3

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

Problem Types: CWE-22 | CWE-59 | CWE-73 | CWE-377 | CWE-22 CWE-22 | CWE-377 CWE-377 | CWE-59 CWE-59 | CWE-73 CWE-73

VersionSourceTypeScoreSeverityVector
4.05d1c2695-1a31-4499-88ae-e847036fd7e3Secondary7.1HIGHCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:X/C...
4.0CNADECLARED7.1HIGHCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
Low
User Interaction
None
Confidentiality
None
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
High
Sub Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA WatchGuard Fireware OS affected 2025.1 2026.4 custom Default
CNA WatchGuard Fireware OS affected 12.0 12.12.4 custom Default
CNA WatchGuard Fireware OS affected 12.0 12.5.22 custom T15/T35

References

ReferenceSourceLinkTags
psirt.watchguard.com/CVE-2026-93864 5d1c2695-1a31-4499-88ae-e847036fd7e3 psirt.watchguard.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: WatchGuard AI Security Research (en)

Additional Advisory Data

Solutions

CNA: Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22

Exploits

CNA: WatchGuard is not aware of any exploitation of this vulnerability in the wild.

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