CVE-2026-93857 | BDVDB-2026-396285 Detail

WatchGuardFireware OS

Description#

A stack-based buffer overflow vulnerability in Fireware OS's SIP proxy allows a remote, unauthenticated attacker to execute arbitrary code by sending a specially crafted request through a policy that uses the SIP proxy.

Impact#

Per CVSS v4.0: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-121
CWE-787 Out-of-bounds Write

References#

https://psirt.watchguard.com/CVE-2026-93857

Exploit#

No public exploit known

History#

Version 12026-10-27Record published in the CVE List.
Version 22026-10-29Most recent update recorded in the CVE List.

Published

Published: 2026-10-27
Last modified: 2026-10-29

Vendor information

Vendor: WatchGuard
Product: Fireware OS

All WatchGuard vulnerabilities

Score

9.2 Critical

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 46.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 2025.1 and < 2026.4
Fixed
2026.4
Vulnerable
>= 12.0 and < 12.12.4
Fixed
12.12.4
Vulnerable
>= 12.0 and < 12.5.22
Fixed
12.5.22

Scoring System

CVSS v4.0

9.2 Critical

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	High
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).