8.2High
CVE-2026-86128Fireware OS NULL Pointer Dereference in NetFlow IPv6 Traffic Processing Allows Remote Denial of Service
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.
Weakness (CWE):
CWE-476
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| watchguard | fireware | 12.0 – < 12.5.21 | |
| WatchGuard | Fireware OS | 2026.3 – < 2026.3.2, 2025.0 – < 2026.2.3, 12.0 – < 12.12.3 |
References and patches
- https://psirt.watchguard.com/CVE-2026-86128 vendor-advisoryPatchVendor Advisory
CPE matches (NVD) (4)
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*≥ 12.0 < 12.5.21cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*≥ 12.12 < 12.12.3cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*≥ 2025.0 < 2026.2.3cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*≥ 2026.3 < 2026.3.2