What is CVE-2019-9748?

CVE-2019-9748 is a critical-severity vulnerability in Tinysvcmdns Project, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2019-03-13.

How severe is CVE-2019-9748?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Out-of-bounds Read in Tinysvcmdns Project

CVE-2019-9748

In tinysvcmdns through 2018-01-16, an mDNS server processing a crafted packet can perform arbitrary data read operations up to 16383 bytes from the start of the buffer. This can lead to a segmentation fault in uncompress_nlabel in mdns.c and a crash of the server (depending on the memory protection of the CPU and the operating system), or disclosure of memory content via error messages or a server response. 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."

Vulnerability class: Buffer Overflow

Published 2019-03-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.024 (83.5th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

Tinysvcmdns Project

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

bitbucket.org/geekman/tinysvcmdns/issues/10/arbitrary-memory-read-while-parsing (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-9748?: CVE-2019-9748 is a critical-severity vulnerability in Tinysvcmdns Project, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2019-03-13.
How severe is CVE-2019-9748?: Critical severity. CVSS v3 base score is 9.1 out of 10.