Zero Radar
← feed
CriticalVulnerabilityCVE-2026-112709updated 27 Oct 2026, 19:35 UTC

Firewall login service can be crashed or taken over via fake directory replies

Attackers who can sit in the network path to the company's directory server (Active Directory) can send a specially crafted reply that breaks the firewall's login service. This can take the firewall offline or possibly let an attacker run t

Official, 2 sources
SeverityCriticalCVSS 9.2 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1Attacker in network pathControls or intercepts traffic to the directory server
  2. 2Forged AD responseCrafted reply sent to the firewall
  3. 3Auth service overflowHeap buffer overflow in authentication service
  4. 4Firewall impactService crashes or code runs on device
  5. ResultFirewall crashes or attacker gains control

What happened

A heap-based buffer overflow in the Fireware OS authentication service is triggered by a malformed response from a configured Active Directory server, enabling denial of service and potentially arbitrary code execution.

Why it is dangerous: A successful attack can knock the firewall offline, cutting off network access, and could give an attacker full control of the device that guards the network perimeter.

Are you affected?

You are affected if your Fireware OS firewall is configured to authenticate users against an Active Directory server, and an attacker can control or intercept traffic to that server.

What to do

  1. Check the vendor advisory for the list of affected Fireware OS versions and the fixed release
  2. Update Fireware OS to a fixed version as soon as one is available
  3. Until patched, restrict and monitor network paths between the firewall and the Active Directory server

Timeline

  1. 27 Oct 2026, 16:17 UTC
    Publicly disclosed
  2. 27 Oct 2026, 16:17 UTC
    Reported by NVD · NVD
  3. 27 Oct 2026, 16:20 UTC
    Picked up by Zero Radar
  4. 27 Oct 2026, 19:35 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-112709 · GHSA-9g3h-x65r-8m8p
CVSS
9.2 / 10
EPSS
0.4% chance of exploitation within 30 days
Disclosed
27 Oct 2026, 16:17 UTC
On Zero Radar
27 Oct 2026, 16:20 UTC (3 min after disclosure)
Last change
27 Oct 2026, 19:35 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Firewall login service can be crashed or taken over via fake directory replies · Zero Radar