CVE-2026-86104

Q: How do I fix CVE-2026-86104?

Upgrade fireware to 12.12.3 or later.

Q: Is CVE-2026-86104 being actively exploited?

Not that we know of. CVE-2026-86104 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.36% is the estimated probability that it will be exploited in the next 30 days. That is higher than 29% of all scored CVEs.

Q: How severe is CVE-2026-86104?

CVE-2026-86104 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-2026-86104 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 uncontrolled resource consumption vulnerability in the Fireware OS login process (wgagent) allows a remote, unauthenticated attacker to cause a denial of service by sending a specially crafted request.

CWE-400Resource Exhaustion CWE-409 CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

firewareNVD

Affected:>= 12.12, < 12.12.3Fixed in:12.12.3CVE-2026-86104derived from NVD

Affected:>= 2026.3, < 2026.3.2Fixed in:2026.3.2CVE-2026-86104derived from NVD

Affected:>= 2025.0, < 2026.2.3Fixed in:2026.2.3CVE-2026-86104derived from NVD

Affected:>= 12.0, < 12.5.21Fixed in:12.5.21CVE-2026-86104derived 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

0.36%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Patch1

psirt.watchguard.com

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2023-21547	High	7.5	89%	-	Fix
CVE-2018-1000115	High	7.5	88%	-	Fix

Common questions

How do I fix CVE-2026-86104?

Upgrade fireware to 12.12.3 or later.

Is CVE-2026-86104 being actively exploited?

Not that we know of. CVE-2026-86104 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.36% is the estimated probability that it will be exploited in the next 30 days. That is higher than 29% of all scored CVEs.

How severe is CVE-2026-86104?

CVE-2026-86104 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-2026-86104 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-2026-86104

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.