What’s Vulnerable › Vulnerabilities

CVE-2019-9747

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-03-13 · updated 2026-06-17
• Weakness: CWE-835

Description

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

• Talos Tinysvcmdns: through 2018-01-16

References

• https://bitbucket.org/geekman/tinysvcmdns/issues/11/denial-of-service-vulnerability-infinite
• https://bitbucket.org/geekman/tinysvcmdns/issues/11/denial-of-service-vulnerability-infinite

Get alerted when CVE-2019-9747 or the next vulnerability affects your stack