PT-2026-55339 · Watchguard · Fireware Os

Published 2026-07-02 · Updated 2026-07-03 · CVE-2026-8247

Positive Technologies (AI Summary)

CVSS v4.0

7.7

High

Base vector

AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions WatchGuard Fireware OS versions 11.0 through 11.12.4 Update1 WatchGuard Fireware OS versions 12.0 through 12.12 WatchGuard Fireware OS versions 2025.1 through 2026.2

Description An Out-of-bounds Write issue exists where an unauthenticated attacker located on the same local network segment can execute arbitrary code. An Out-of-bounds Write occurs when the software writes data past the end of the intended buffer, potentially corrupting memory.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

CVE-2026-8247

Affected Products

Fireware Os

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-8247 · Security Note
• https://watchguard.com/wgrd-psirt/advisory/wgsa-2026-00026 · Vendor Advisory
• https://twitter.com/infoflowcloud/status/2072868283758309575 · Twitter Post
• https://twitter.com/CVEnew/status/2072867218665218506 · Twitter Post