CVE-2026-13084: A null pointer dereference vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker

Q: How do I fix CVE-2026-13084?

fireware: upgrade to 11.12.4, 12.5.19, 12.12.1, 2026.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-13084 being exploited?

CVE-2026-13084 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-13084 affect?

CVE-2026-13084 affects fireware. Severity is high (CVSS 7.5). A null pointer dereference vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker to create a denial-of-service (DoS) condition by sending specially crafted IKEv2 messages. This vulnerability affects both the Mo

Q: How urgent is CVE-2026-13084?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-13084 is a high-severity flaw (CVSS 7.5) affecting fireware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A null pointer dereference vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker to create a denial-of-service (DoS) condition by sending specially crafted IKEv2 messages. This vulnerability affects both the Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when configured with a dynamic gateway peer. This vulnerability affects Fireware OS 11.10.2 up to and including 11.12.4_Update1, 12.0 up to and in

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-07-03
Last modified	2026-10-25

Publisher (CNA): WatchGuard Technologies, Inc. · Vendor: watchguard

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-03 00:16 UTCPublished CVE record published
2026-10-25 21:10 UTCUpdated Record last modified

watchguard fireware UPGRADE

Affected: >= 12.5 and < 12.5.19 · >= 11.0.0 and < 11.12.4 · 11.12.4 · 11.12.4 u1 · >= 12.0 and < 12.12.1 · >= 2025.1 and < 2026.2.1

Fixed in: 11.12.4, 12.5.19, 12.12.1, 2026.2.1

Safe to downgrade to: a release before 11.0.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-13084?

fireware: upgrade to 11.12.4, 12.5.19, 12.12.1, 2026.2.1. Exact commands for each OS are on this page.

Is CVE-2026-13084 being exploited?

CVE-2026-13084 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-13084 affect?

CVE-2026-13084 affects fireware. Severity is high (CVSS 7.5). A null pointer dereference vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker to create a denial-of-service (DoS) condition by sending specially crafted IKEv2 messages. This vulnerability affects both the Mo

How urgent is CVE-2026-13084?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

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References

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