CVE-2026-19313

criticalpriority · track · 0EPSS 0.005 · 40 %ileDENL

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.47% (40th) EPSS

CVSS 9.3 · critical

Is it mine?

14 products

Check your exposure

Who says so?

2 sources

cert_bund · ncsc_nl

EPSS · scored 2026-10-22

An heap overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.

cvss

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

9.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.3

v4.09.3criticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/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:Xsecondary

v4.08.1highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-122USCWE-122USCWE-190USCWE-680US

affected products (14)

Products and version ranges known to be affected.

WatchGuard Firebox OS <12.12.1all versionscert_bundDE
WatchGuard Firebox OS <12.12.2all versionscert_bundDE
WatchGuard Firebox OS <2026.2.1all versionscert_bundDE
WatchGuard Firebox OS <2026.2.2all versionscert_bundDE
WatchGuard Firebox OS T15/T35 <12.5.18all versionscert_bundDE
WatchGuard Firebox OS T15/T35 <12.5.20all versionscert_bundDE
WatchGuard Firebox≤ OS <12.12.2cert_bundDE
WatchGuard Firebox≤ OS <12.12.1cert_bundDE
WatchGuard Firebox≤ OS <2026.2.1cert_bundDE
WatchGuard Firebox≤ OS <2026.2.2cert_bundDE
WatchGuard Firebox≤ OS T15/T35 <12.5.18cert_bundDE
WatchGuard Firebox≤ OS T15/T35 <12.5.20cert_bundDE
WatchGuard Firebox≤ vers:unknown/*ncsc_nlNL
WatchGuard Fireware OS≤ vers:unknown/*ncsc_nlNL

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2026-0335Kwetsbaarheden verholpen in WatchGuard Fireware OSNL2026-09-01csaf · ncsc_nlNL
WatchGuard heeft kwetsbaarheden verholpen in WatchGuard Fireware OS, specifiek in het iked-proces en de epm-service van het Mobile Security onderdeel.
WID-SEC-W-2026-3068WatchGuard Firebox OS: Mehrere SchwachstellenDeutsch2026-08-27csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in WatchGuard Firebox OS ausnutzen, um beliebigen Code – einschließlich Code mit Root-Rechten – auszuführen oder einen Denial-of-Service-Zustand herbeizuführen.

sources

Which sources assert this record, and when.

cert_bund ncsc_nl NVD CVE.org MITRE

published 2026-08-28modified 2026-09-03

references (1) nvd

External citations — patches, advisories, analysis.

https://psirt.watchguard.com/CVE-2026-19313

scry

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