Is this vulnerability remotely exploitable over the internet?

It can be exploitable remotely if the Pi-hole admin interface or API is exposed beyond a trusted network and an attacker can authenticate or otherwise obtain configuration-changing privileges. In many home setups, access is limited to the local network, which still allows remote attack from any device on that network.

What level of access does an attacker need to exploit this?

The attacker must be able to modify the `dhcp.leaseTime` parameter via the Pi-hole interface or API. This typically requires an authenticated admin session or equivalent API token, so compromise of admin credentials or tokens is a key prerequisite.

What is the safest general fix pattern for developers of similar systems?

Treat configuration fields as strictly typed data and enforce rigid validation on input, especially for values written into configuration files consumed by other processes. Disallow control characters, avoid raw string concatenation when generating configurations, and ensure no user-controlled parameter can alter file structure or command syntax.

Severity:

HIGH RISK

(8.8)

Command Injection via DHCP Lease Time (CWE-78) in Pi-hole FTL (FTLDNS)

CVE-2026-35520

Published:

Apr 7, 2026

Status:

Undergoing Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

Remote Code Execution on the Router

April 12, 2026

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Remote Code Execution on the Router

April 12, 2026

Vulnerability Type

Category:

Command Injection

CWE:

CWE-78;CWE-93

Impact:

Remote Code Execution

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Command Injection

CWE:

CWE-78;CWE-93

Impact:

Remote Code Execution

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Command Injection via DHCP Lease Time (CWE-78) in Pi-hole FTL (FTLDNS)

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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