CVE WatchAug 11, 2026

CVE-2025-14733

WatchGuard Firebox Out of Bounds Write Vulnerability

CVSS

9.8

Critical

EPSS

26.5%

p98

KEV

YES

Dec 19, 2025

Exploit Today

0-100

Published: Dec 19, 2025 · Last modified: Aug 11, 2026 · CWE-787

EPSS · 30d

21.8%EPSS · 30 days26.5%

2026-08-032026-08-31

KEV catalog record

Product

WatchGuard / Firebox

Vulnerability

WatchGuard Firebox Out of Bounds Write Vulnerability

Added to KEV

Dec 19, 2025

Remediate by

Dec 26, 2025

Known ransomware use

Summary description

WatchGuard Fireware OS iked process contains an out of bounds write vulnerability in the OS iked process. This vulnerability may allow a remote unauthenticated attacker to execute arbitrary code and affects both the mobile user VPN with IKEv2 and the branch office VPN using IKEv2 when configured with a dynamic gateway peer.

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.

Notes

Check for signs of potential compromise on all internet accessible instances after applying mitigations. For more information please see: https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00027 ; https://nvd.nist.gov/vuln/detail/CVE-2025-14733

Technical 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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-826808.8 HIG

—

——0A weakness has been identified in D-Link DSM-G600 1.01. This affects an unknown function of the file /load_file.cgi of the component Multipart Handler. Executing a manipulation can lead to out-of-bounds write. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.10h CVE-2026-58106—

2.7%

——1CVE-2025-40843 https://github.com/advisories/GHSA-5xf2-f6ch-6p8r was fixed by replacing unchecked strcpy() with a bounded safe_strcpy() helper. At ldlogger-tool-gcc.c:129 the destination passed to that helper is fullPath + 2, but the size passed down is the full PATH_MAX. safe_strcpy() is strncpy(), which NUL-pads the destination out to the whole n, so this site writes 4096 bytes into the 4094 that remain — a 2-byte stack overflow on every invocation, independent of the input path's length. This issue affects CodeChecker: through 6.28.2.3d CVE-2026-183935.4 MED

16.8%

——5A flaw was found in FFmpeg. The tdsc_load_cursor() function writes beyond the bounds of a heap-allocated buffer when processing crafted TDSC cursor data. A remote attacker could exploit this by supplying a specially crafted video file, potentially leading to a denial of service or arbitrary code execution.3d CVE-2026-78011—

24.6%

——7An integer underflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.3d CVE-2026-78010—

25.2%

——8A stack-based buffer overflow vulnerability in the WatchGuard Fireware OS iked process iallows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.3d CVE-2026-78008—

23.2%

——7A buffer overflow vulnerability in the WatchGuard Fireware OS Management Web UI allows an authenticated administrator with network access to cause a denial of service (DoS) condition or potentially execute arbitrary code by sending specially crafted network traffic.3d