CVE-2026-86131

criticalpriority · track · 39EPSS 0.004 · 35 %ileDENLUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.42% (35th) EPSS

CVSS 9.8 · critical

Is it mine?

16 products

Check your exposure

Who says so?

3 sources

cert_bund · ncsc_nl · nvd

EPSS · scored 2026-10-23

A code injection vulnerability in WatchGuard Fireware OS's BOVPN Over TLS client configuration handling allows an attacker who controls the remote VPN server to execute arbitrary commands as root on the connecting Firebox.

cvss

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

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.2–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL

v4.09.2criticalCVSS:4.0/AV:N/AC:L/AT:P/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

v4.07.2highCVSS:4.0/AV:N/AC:L/AT:P/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-295USCWE-295USCWE-829USCWE-94US

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-2026-86131PatchVendor Advisory

scry

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