External risk intelligence

Barracuda OS Command Injection via Timezone Configuration.

CVE advisoryKnown Exploit

CVE-2026-111560

This vulnerability affects Barracuda network appliances, such as Email Security Gateways, Load Balancers, and Web Application Firewalls. These products are commonly deployed as internet-facing edge services or gateway appliances to manage and secure network traffic, making them highly likely to be reachable from the public internet in standard deployments.

OS Command Injection

Barracuda Networks Multiple Products

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in certain Barracuda appliance products allows an authenticated administrator to inject operating system commands with root privileges by manipulating the timezone setting. This could lead to a compromise of the appliance.

Authenticated users can run commands as root.
This impacts critical network security appliances.
Confirm relevance and exposure of affected systems.

Attack Path

How an attacker could exploit the issue

An attacker with administrative access to a vulnerable Barracuda appliance can exploit this vulnerability by crafting a malicious timezone value. When this value is processed by the system, it can lead to the execution of arbitrary operating system commands with root privileges. This could potentially allow an attacker to gain complete control over the affected appliance.

Requires administrator access to the appliance.
Triggered by processing a crafted timezone value.
Allows unauthorized root command execution.

Live Threat

Current exploitation, exposure, and threat context

An authenticated administrator could execute arbitrary operating system commands with root privileges on certain Barracuda appliance products. This could occur when a specially crafted timezone value is processed by the appliance.

Appliance OS commands and configuration.
Processing crafted timezone data.
Unauthorized system control.

Operational Fix

Recommended remediation, mitigation, and detection steps

The potential for OS command injection with root privileges on affected Barracuda appliances, including ESG, Load Balancer, and WAF products, points to a shared responsibility between application owners who manage the specific appliance configurations and the infrastructure or platform teams responsible for the underlying Barracuda code and its deployment. The initial practical move involves identifying all instances of these Barracuda products, assessing their exposure and criticality, and then coordinating with the relevant teams for remediation planning based on risk.

Owner: Infrastructure and Application teams.
Verify: Internet exposure and business criticality.
Action: Plan vendor-coordinated remediation.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Barracuda appliance software?

These products function as network infrastructure and security gateways. Examples include Email Security Gateways, Load Balancers, Web Application Firewalls, and Message Archivers. Organizations deploy these to manage, filter, and secure data traffic at the network edge. Because they sit between the internet and internal environments, they perform critical tasks like inspecting traffic and enforcing security policies across the enterprise.

What does CVE-2026-111560 mean for security?

This vulnerability is classified as Improper Neutralization of Special Elements used in an OS Command, known as CWE-78. It means the system fails to filter out malicious code injected into a specific input field. In this case, when a user saves a manipulated timezone setting, the appliance mistakenly interprets that text as a command to execute on the underlying operating system with root-level power.

How is this command injection triggered?

The flaw requires an attacker to already have administrative-level access to the appliance's management interface. By inputting a specially crafted value into the timezone configuration field, they can force the system to run arbitrary commands. Simply interacting with the device or having a standard user account is not enough to trigger the bug; it requires someone to actively submit that specific, malformed configuration data.

Is my Barracuda appliance at risk?

According to Halo Surface Signal, these appliances are frequently deployed as internet-facing edge services, making them highly reachable from the public internet. If you manage these devices, they are likely part of your external attack surface. You should prioritize checking any instance that is accessible from the network to ensure it is not reachable by unauthorized parties.

How should I respond to this threat?

First, compile an inventory of all Barracuda appliances across your environment. Coordinate with your infrastructure and security teams to verify the internet exposure and criticality of each system. Rather than attempting to manually sanitize settings, follow the specific remediation steps provided by the vendor to address the underlying vulnerability in the common code used by these appliances.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.