CVE-2026-13086

Fireware OS Stack-Based Buffer Overflow in Mobile Security epm Endpoint

At a glance

Severity: CRITICAL 9.3
EPSS: EPSS 0.66 % · percentile 51 (2026-10-27)
State: PUBLISHED
Published: 2026-08-27
Updated: 2026-09-03
Assigner: WatchGuard
NVD status: Deferred

Description

A stack-based buffer overflow in the epm (Endpoint Protection Manager) service used by the deprecated Mobile Security feature in WatchGuard Fireware OS allows an unauthenticated remote attacker to execute arbitrary code.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	CRITICAL 9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	WatchGuard
CVSS 4.0	CRITICAL 9.3	CVSS: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:X	NVD · 5d1c2695-1a31-4499-88ae-e847036fd7e3 (Secondary)

Weaknesses (CWE)

European references

ENISA EUVD · EUVD-2026-67334
GCVE · GCVE-0-2026-13086

Affected products

Product	Versions
WatchGuard · Fireware OS	affected 2025.0 < 2026.2.2 ; affected 12.0 < 12.12.2 ; affected 2026.3 < 2026.3.1
WatchGuard · Fireware OS	affected 12.0 < 12.5.20

References

https://psirt.watchguard.com/CVE-2026-13086

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