CVE-2019-9747: Tinysvcmdns Project Tinysvcmdns

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

In tinysvcmdns through 2018-01-16, a maliciously crafted mDNS (Multicast DNS) packet triggers an infinite loop while parsing an mDNS query. When mDNS compressed labels point to each other, the function uncompress_nlabel goes into an infinite loop trying to analyze the packet with an mDNS query. As a result, the mDNS server hangs after receiving the malicious mDNS packet. NOTE: the product's web site states "This project is un-maintained, and has been since 2013. ... There are known vulnerabilities ... You are advised to NOT use this library for any new projects / products."

Affected products

• Tinysvcmdns Project Tinysvcmdns: up to and including 2018-01-16

Published 2019-03-13. Last modified 2026-06-17.