CVE-2026-86128

highpriority · track · 30EPSS 0.004 · 30 %ileDENLUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.36% (30th) EPSS

CVSS 7.5 · high

Is it mine?

16 products

Check your exposure

Who says so?

3 sources

cert_bund · ncsc_nl · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.6–8.2

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · NCSC-NL NL

v4.08.2highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/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:Xsecondary

v4.04.6mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-476USCWE-476US

affected products (16)

Products and version ranges known to be affected.

WatchGuard Fireware OS <12.11.10all versionscert_bundDE
WatchGuard Fireware OS <12.12.3all versionscert_bundDE
WatchGuard Fireware OS <12.5.21all versionscert_bundDE
WatchGuard Fireware OS <2026.2.3all versionscert_bundDE
WatchGuard Fireware OS <2026.3.2all versionscert_bundDE
WatchGuard Fireware OS< 12.11.10cert_bundDE
WatchGuard Fireware OS< 12.12.3cert_bundDE
WatchGuard Fireware OS< 12.5.21cert_bundDE
WatchGuard Fireware OS< 2026.2.3cert_bundDE
WatchGuard Fireware OS< 2026.3.2cert_bundDE
WatchGuard Fireware≤ vers:unknown/*ncsc_nlNL
WatchGuard Fireware OS≤ vers:unknown/*ncsc_nlNL
watchguard fireware12.0 → 12.5.21nvdUScpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
watchguard fireware12.12 → 12.12.3nvdUScpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
watchguard fireware2025.0 → 2026.2.3nvdUScpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
watchguard fireware2026.3 → 2026.3.2nvdUScpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2026-0404Kwetsbaarheden verholpen in WatchGuard Fireware OSNL2026-10-07csaf · ncsc_nlNL
WatchGuard heeft meerdere kwetsbaarheden verholpen in Fireware OS.
WID-SEC-W-2026-3646WatchGuard Fireware OS: Mehrere SchwachstellenDeutsch2026-09-29csaf · cert_bundDE
Ein entfernter Angreifer kann mehrere Schwachstellen in WatchGuard Fireware OS ausnutzen, um beliebigen Code auszuführen – einschließlich Code mit Root-Rechten –, Sicherheitsmaßnahmen zu umgehen, vertrauliche Daten offenzulegen oder zu manipulieren und Denial-of-Service-Zustände zu verursachen.

sources

Which sources assert this record, and when.

cert_bund ncsc_nl nvd NVD CVE.org MITRE

published 2026-09-30modified 2026-10-06

references (1) nvd

External citations — patches, advisories, analysis.

https://psirt.watchguard.com/CVE-2026-86128PatchVendor Advisory

scry

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