Buffer overflow in Watchguard Fireboxcloud

CVE-2025-14733

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS 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…

Vulnerability class: Buffer Overflow

EPSS: 0.183 (96.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-14733?
CVE-2025-14733 is a critical-severity vulnerability in Watchguard Fireboxcloud, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2025-12-19.
How severe is CVE-2025-14733?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-14733 known to be exploited?
Yes. CVE-2025-14733 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-19), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.