CVE-2026-86133

Q: How do I fix CVE-2026-86133?

Upgrade fireware to 12.12.3 or later.

Q: Is CVE-2026-86133 being actively exploited?

Not that we know of. CVE-2026-86133 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.35% is the estimated probability that it will be exploited in the next 30 days. That is higher than 26% of all scored CVEs.

Q: How severe is CVE-2026-86133?

CVE-2026-86133 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-86133 affect?

Published advisories record a fix for fireware (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

7.5

CVSS v3

NVD

Description

An integer underflow vulnerability in the WatchGuard Fireware OS IKE daemon (iked) allows a remote attacker who has completed the initial IKEv2 handshake to crash the iked process by sending a specially crafted encrypted IKEv2 message, resulting in a denial of service.

CWE-191 CWE-1284

How to fix

Remediation Available

firewareNVD

Affected:>= 12.12, < 12.12.3Fixed in:12.12.3CVE-2026-86133derived from NVD

Affected:>= 2026.3, < 2026.3.2Fixed in:2026.3.2CVE-2026-86133derived from NVD

Affected:>= 12.0, < 12.5.21Fixed in:12.5.21CVE-2026-86133derived from NVD

Affected:>= 2025.0, < 2026.2.3Fixed in:2026.2.3CVE-2026-86133derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.35%probability of exploitation in 30 days

26thpercentile

Low risk: more likely to be exploited than 26% of all known CVEs.

References

Patch1

psirt.watchguard.com

Related Vulnerabilities

Other CWE-191 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0497	Critical	9.8	100%	KEV	Fix
CVE-2020-36228	High	7.5	85%	-	Fix
CVE-2020-36221	High	7.5	85%	-	Fix
CVE-2024-38063	Critical	9.8	71%	-	Fix
CVE-2017-14496	High	7.5	66%	-	Fix
CVE-2004-0184	Medium	5.0	60%	-	Fix

Common questions

How do I fix CVE-2026-86133?

Upgrade fireware to 12.12.3 or later.

Is CVE-2026-86133 being actively exploited?

Not that we know of. CVE-2026-86133 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.35% is the estimated probability that it will be exploited in the next 30 days. That is higher than 26% of all scored CVEs.

How severe is CVE-2026-86133?

CVE-2026-86133 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-86133 affect?

Published advisories record a fix for fireware (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-86133

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-06.