CVE-2026-13086 PUBLISHED

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

Assigner: WatchGuard
Reserved: 23.06.2026 Published: 27.08.2026 Updated: 27.08.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	WatchGuard
Product	Fireware OS
Versions	Default: unaffected affected from 2025.0 to 2026.2.2 (excl.) affected from 12.0 to 12.12.2 (excl.)

Vendor	WatchGuard
Product	Fireware OS
Versions	Default: unaffected affected from 12.0 to 12.5.20 (excl.)

Affected Configurations

By default, the epm service is only reachable on Trusted interfaces on devices where the deprecated Mobile Security is enabled.

Exploits

WatchGuard is not aware of any exploitation of this vulnerability in the wild.

Solutions

Fireware OS 2026.2.2, Fireware OS 12.12.2, Fireware OS 12.5.20

Credits

Mat Powell of TrendAI Zero Day Initiative finder

References

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

Problem Types

CWE-121 CWE
CWE-787 CWE
CWE-798 CWE