CVE-2026-3344Network attack vector

Limited persistence via malicious firmware update package

Published Mar 3, 2026 · Updated Mar 3, 2026

Expected behavior violation in WatchGuard Fireware OS allows remote authenticated users to maintain limited persistence via a crafted update package. The firmware update path accepts a maliciously crafted package that bypasses the Fireware OS filesystem integrity check. High-privilege authenticated access is required; affected releases are 12.0 through 12.11.7, 12.5.9 through 12.5.16, and 2025.1 through 2026.1.1.

CVSS severity6.9
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Expected behavior violation in WatchGuard Fireware OS allows remote authenticated users to maintain limited persistence via a crafted update package. The firmware update path accepts a maliciously crafted package that bypasses the Fireware OS filesystem integrity check. High-privilege authenticated access is required; affected releases are 12.0 through 12.11.7, 12.5.9 through 12.5.16, and 2025.1 through 2026.1.1.

The record

CVE
CVE-2026-3344
Published
Mar 3, 2026
Updated
Mar 3, 2026
Vendor
WatchGuard Technologies
Product
Fireware OS
Classifications
CWE-440, CAPEC-184, T1554
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 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=12.0 <=12.11.7
  2. Affected versionversion=12.5.9 <=12.5.16
  3. Affected versionversion=2025.1 <=2026.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WatchGuard Technologies · Fireware OSversion=12.0 <=12.11.7; version=12.5.9 <=12.5.16; version=2025.1 <=2026.1.1

Published CVSS scores

6.9WatchGuard TechnologiesCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A: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-440Expected Behavior Violation
CAPEC-184Software Integrity Attack
T1554Compromise Host Software Binary

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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