8.6

CVE-2026-3342: WatchGuard Firebox Out of Bounds Write Vulnerability

Analyzed
Published 03-03-2026Last modified 04-03-2026

Vulnerability summary

CVE-2026-3342 is a high (CVSS 8.6) Out-of-bounds Write vulnerability in watchguard fireware. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53.2% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.6/10
010
High · v4.0 (CVE.org)
EPSS score
0.72%
0%100%
Low · -5.68 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 03-03-2026
    PublishedVulnerability first disclosed.
  2. 04-03-2026
    Last modifiedVulnerability information updated.

Description

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an authenticated privileged administrator to execute arbitrary code with root permissions via an exposed management interface. This vulnerability affects Fireware OS 11.9 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.7 and 2025.1 up to and including 2026.1.1.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.72%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

Decrease -5.68 pp

From 6.40% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Watchguard2 products
  • fireware≥ 12.5, < 12.5.17 | ≥ 2025.1, < 2026.1.2 | ≥ 11.9, < 12.11.8
  • fireware os≥ 11.9, ≤ 11.12.4+541730 | ≥ 12.0, ≤ 12.11.7 | ≥ 12.5, ≤ 12.5.16 | ≥ 2025.1, ≤ 2026.1.1

1 vendor · 2 products

References

1 links