9.8

CVE-2025-14733: WatchGuard Firebox Out of Bounds Write Vulnerability

CVSS: 9.8v3.1CriticalKEVRansomwareAnalyzed
Published 19-12-2025Last modified 09-09-2026
Open JSON

Vulnerability summary

CVE-2025-14733 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in WatchGuard Firebox. It is known to be exploited: CISA lists it, first on 19-12-2025. It has been used in ransomware campaigns. EPSS estimates a 26.51% chance of exploitation in the next 30 days, higher than 98% of scored vulnerabilities.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
26.51%
0%100%
High · 0.00 pp in 30 days
KEVListedCISA
RansomwareKnown useFlagged by CISA
Public exploits0No public exploits recorded

Timeline

  1. 19-12-2025
    PublishedVulnerability first disclosed.
  2. 19-12-2025
    Added to CISA KEVWatchGuard Firebox Out of Bounds Write Vulnerability
  3. 26-12-2025
    CISA remediation dueApply mitigations per vendor instructions.
  4. 09-09-2026
    Last modifiedVulnerability information updated.

Description

An Out-of-bounds Write vulnerability in the WatchGuard Fireware OS iked process may allow a remote unauthenticated attacker to execute arbitrary code. This vulnerability affects both the mobile user VPN with IKEv2 and the branch office VPN using IKEv2 when configured with a dynamic gateway peer. If the Firebox was previously configured with the mobile user VPN with IKEv2 or a branch office VPN using IKEv2 to a dynamic gateway peer, and both of those configurations have since been deleted, that Firebox may still be vulnerable if a branch office VPN to a static gateway peer is still configured.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

26.51%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

0.00 pp

From 26.51% on 21-09-2026

21-09-202621-10-2026
EPSS score
26.51%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
19-12-2025
Federal due date
26-12-2025
Ransomware

CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. nvd.nist.gov/vuln/detail/CVE-2025-14733

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Watchguard2 products
  • fireware≥ 11.10.2, < 12.5.15 | ≥ 11.10.2, < 12.11.6 | ≥ 2025.1, < 2025.1.4
  • fireware os≥ 2025.1, < 2025.1.4 | ≥ 12.0, < 12.11.6 | ≥ 11.10.2, ≤ 11.12.4+541730 | ≥ 12.0, < 12.3.1+728352 | ≥ 12.0, < 12.5.15

1 vendor · 2 products

References

3 links