---
title: "CVE-2026-103593: Fireware OS - Remote Code Execution & Privilege Escalation"
description: "Fireware OS contains a stack-based buffer overflow caused by improper handling of certificates in the logging service, letting network-adjacent attackers who can impersonate or intercept log server traffic execute arbitrary code with root privileges, exploit requires attacker to intercept or impersonate log server traffic."
url: https://panop.io/threat-heartbeat/CVE-2026-103593/
---

# CVE-2026-103593 Fireware OS - Remote Code Execution & Privilege Escalation

Fireware OS contains a stack-based buffer overflow caused by improper handling of certificates in the logging service, letting network-adjacent attackers who can impersonate or intercept log server traffic execute arbitrary code with root privileges, exploit requires attacker to intercept or impersonate log server traffic.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.10% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103593)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution, Privilege Escalation

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

27 October 2026

Updated

29 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest Fireware OS version with the vulnerability fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103593](https://nvd.nist.gov/vuln/detail/CVE-2026-103593)
- [https://psirt.watchguard.com/CVE-2026-103593](https://psirt.watchguard.com/CVE-2026-103593)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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