CVE-2021-29448: Pi-hole Ftldns

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Pi-hole is a Linux network-level advertisement and Internet tracker blocking application. The Stored XSS exists in the Pi-hole Admin portal, which can be exploited by the malicious actor with the network access to DNS server. See the referenced GitHub security advisory for patch details.

Affected products

• Pi-hole Ftldns: version 5.7 only
• Pi-hole Pi-Hole: version 5.2.4 only
• Pi-hole Web Interface: before 5.5 (fixed in 5.5)

Published 2021-04-15. Last modified 2026-06-17.