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CVE-2026-86128

Fireware OS NULL Pointer Dereference in NetFlow IPv6 Traffic Processing Allows Remote Denial of Service

HIGH
7.5
CVSS Score
Published: September 29, 2026 at 11:05 PM UTC
Updated: October 6, 2026 at 08:42 PM UTC
1 product affected across 1 vendorFireware

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

A NULL pointer dereference vulnerability in Fireware OS's NetFlow packet-processing feature allows a remote, unauthenticated attacker to cause a denial of service by sending a specially crafted IPv6 packet.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fireware· WatchGuard
95%
12.0 ≤ v < 12.12.312.0 ≤ v < 12.5.2112.12 ≤ v < 12.12.32025.0 ≤ v < 2026.2.32026.3 ≤ v < 2026.3.212.02025.02026.3
Affected range stops below 12.12.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.5.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.2.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 2026.3.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://psirt.watchguard.com/CVE-2026-86128

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-476

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