CVE-2026-13722Network attack vector

Tampered firmware installation via backup-image signature bypass

Published Jul 2, 2026 · Updated Jul 2, 2026

Firmware validation bypass in WatchGuard Fireware OS allows remote authenticated users to install tampered firmware through backup restore. The backup/restore image-processing path accepts a backup image without correctly validating its firmware signature. Device Administrator access is required; successful exploitation replaces trusted appliance code and compromises device confidentiality, integrity, and availability.

CVSS severity8.6
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Firmware validation bypass in WatchGuard Fireware OS allows remote authenticated users to install tampered firmware through backup restore. The backup/restore image-processing path accepts a backup image without correctly validating its firmware signature. Device Administrator access is required; successful exploitation replaces trusted appliance code and compromises device confidentiality, integrity, and availability.

The record

CVE
CVE-2026-13722
Published
Jul 2, 2026
Updated
Jul 2, 2026
Vendor
WatchGuard Technologies, Inc.
Product
Fireware OS
Classifications
CWE-347, T1601
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.0 <=11.12.4+541730
  2. Affected versionversion=12.0 <=12.12
  3. Affected versionversion=12.5 <=12.5.18
  4. Affected versionversion=2025.1 <=2026.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WatchGuard Technologies, Inc. · Fireware OSversion=11.0 <=11.12.4+541730; version=12.0 <=12.12; version=12.5 <=12.5.18; version=2025.1 <=2026.2

Published CVSS scores

7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.6WatchGuard Technologies, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1601Modify System Image

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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