CVE-2026-86131

Fireware OS Code Injection in BOVPN Over TLS Client Allows Remote Code Execution

At a glance

Severity: CRITICAL 9.2
EPSS: EPSS 0.47 % · percentile 40 (2026-10-27)
State: PUBLISHED
Published: 2026-09-29
Updated: 2026-10-01
Assigner: WatchGuard
NVD status: Analyzed

Description

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.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	CRITICAL 9.2	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	WatchGuard
CVSS 4.0	CRITICAL 9.2	CVSS: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:X	NVD · 5d1c2695-1a31-4499-88ae-e847036fd7e3 (Secondary)
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

European references

ENISA EUVD · EUVD-2026-89497
GCVE · GCVE-0-2026-86131

Affected configurations (NVD CPE)

cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 12.0 < 12.5.21
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 12.12 < 12.12.3
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 2025.0 < 2026.2.3
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 2026.3 < 2026.3.2

Affected products

Product	Versions
WatchGuard · Fireware OS	affected 2026.3 < 2026.3.2 ; affected 2025.0 < 2026.2.3 ; affected 12.0 < 12.12.3
WatchGuard · Fireware OS	affected 12.0 < 12.5.21

References

https://psirt.watchguard.com/CVE-2026-86131

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD